Suppose it's fibro myalgia, it is a psychosomatic condition. Taking antidepressants will seem to control the problem temperorily.
You need to tak a detail case history to find the right constitutional medicine for you.
Homeopathy treats the person .
Off hand you can try medicine called
Colocynth in 200 potency. 2 pills 4.times a day for 15 days.
Next Steps
if it helps, it is very likely that it is again a Temperory symptom based medicine, which may not eradicate the condition at its root.
then you should visit a homeopath in person for a proper constitutional treatment.