Your pain is real. The exhaustion is real. You are not making this up.

Low-dose naltrexone (LDN) is one of the more interesting research areas in fibromyalgia treatment. Multiple small clinical trials — including studies from Stanford — have shown that LDN at doses of 1.5–4.5 mg can reduce pain scores in fibromyalgia patients, with very few side effects compared to standard treatments. Evidence level: Moderate, but improving.

The mechanism is thought to involve glial cell modulation in the central nervous system, reducing the neuroinflammation associated with fibromyalgia's central sensitisation. Most rheumatologists in the US don't prescribe it because it's off-label for this use, even though it's well-tolerated. If you want to try it, look for a functional medicine doctor or a pain specialist familiar with the protocol. Compounding pharmacies prepare LDN since the standard 50 mg naltrexone tablet is too high a dose.

There's a real and a frustrating reason. The real reason: SNRIs like duloxetine (Cymbalta) and tricyclic antidepressants like amitriptyline are FDA-approved for fibromyalgia and have moderate evidence for reducing both pain and sleep disturbance. They're not just being prescribed for depression — they affect pain processing pathways.

The frustrating reason: many doctors aren't familiar with the broader fibromyalgia literature, so they default to what they know. If antidepressants don't work for you or you can't tolerate the side effects, there are other evidence-based options worth discussing — pregabalin, LDN, magnesium glycinate, sleep optimisation, low-impact movement protocols, and addressing comorbidities like sleep apnea or small fiber neuropathy. Your treatment shouldn't be antidepressants or nothing.

Magnesium is one of the better-evidenced supplements for fibromyalgia, though the research isn't massive. Several small studies have shown that magnesium deficiency is more common in fibromyalgia patients, and supplementation has reduced tender point sensitivity and improved sleep in trials. Evidence level: Emerging to Moderate.

Form matters. Magnesium oxide (the cheapest and most common drugstore form) is poorly absorbed and mostly causes loose stools. Magnesium glycinate is generally the best-tolerated form for chronic pain — it crosses into the central nervous system, supports sleep, and doesn't cause GI distress at typical doses (200–400 mg/day). Magnesium malate has fans in the fibromyalgia community for daytime energy. Talk to your doctor before adding any supplement, especially if you take medications that affect electrolytes.

Yes — "normal" on a basic CBC and metabolic panel doesn't rule out things that look like fibromyalgia or coexist with it. Conditions worth ruling out (or in) include: hypothyroidism (especially Hashimoto's — needs free T3, free T4, TPO antibodies, not just TSH), vitamin D deficiency, B12 deficiency (note that "normal" B12 ranges in the US are lower than what's optimal for many people), iron deficiency including ferritin (not just hemoglobin), and small fiber neuropathy (often missed, requires skin biopsy or specialised testing).

Also worth considering: ME/CFS overlap, POTS (especially if you feel worse standing), Ehlers-Danlos / hypermobility (common in fibromyalgia patients), and sleep disorders including obstructive sleep apnea. A full work-up is reasonable. "Normal" labs without a thorough comorbidity check is incomplete care.

This is one of the cruelest paradoxes of fibromyalgia: most clinical guidelines recommend graded exercise, but most patients experience post-exertional symptom flares (sometimes called post-exertional malaise, PEM) that can last days. The research has nuance.

For patients with predominantly fibromyalgia (without significant ME/CFS overlap), low-impact aerobic exercise — particularly water-based, like warm-pool aquatic therapy — has the strongest evidence for reducing pain and fatigue over 12+ weeks. Tai chi has surprisingly strong data. Strength training is also helpful but slower to start. The key is starting much smaller than you think you should — like 5 minutes of gentle walking, 3 days per week — and building extremely gradually.

For patients with meaningful PEM or suspected ME/CFS overlap, traditional graded exercise is often harmful. Pacing — staying within an energy envelope — has better outcomes. If exercise consistently makes you crash for days, that's a real signal worth investigating with your doctor; you may be dealing with more than fibromyalgia alone.

Honest answer: it depends on the practitioner. Some functional medicine doctors take fibromyalgia seriously, run thorough labs, look for root causes, and integrate well with conventional treatment. Others recommend expensive supplement protocols, restrictive elimination diets without evidence, and tests of dubious clinical value.

Things a good functional medicine practitioner might investigate that your rheumatologist won't: comprehensive thyroid panel, gut health (SIBO, dysbiosis), nutrient deficiencies beyond the basics, mold/mycotoxin exposure if there's a relevant history, hormone balance, mitochondrial markers, and food sensitivities (with caveats — IgG food sensitivity tests are not well-validated). Be skeptical of anyone who insists on $500/month supplement protocols, claims to cure fibromyalgia, refuses to coordinate with your other doctors, or pushes proprietary tests without explaining what they actually measure.