Lower back pain. (may be irrelevant).

I am a PhD student in biochemistry...my work is to stand for a long..sit for a long. I have a lower back pain from last one year..I have taken so many medications for a particular course of 3 months. Sometime my neck also used to pain. I am doing regular exercise told by my physiotherapist.. Sometime there is irregular back muscle pain..which I think is due to acidity (may be irrelevant)..but some doctor says it is fibromyalgia... Some says lack of vitamin D and calcium.. Some says may be due to stress...I have taken all kind of medicine like dulane M 20..for acidity (PAN 40)..calpol,myoril, Hifenac-P, Etonac th, all different prescription by different doctors...but when I take medicines I feel a little better otherwise it is continuous, unbearable pain. I have done all kind of physiotherapy traction, IR radiation, tensor, ultrasonic gel...but after sometime again it starts..right now it is continuous. I have attached my recent prescription also. Please help me. Thanks