I have had a bad back for years will gaining strength help.?

I have had a slight bulging disc for years. I received a epidural block shot which lasted for five years. My weight jumped to 315lbs. I dropped down to 215 and my back problems started up again. I have therapist chiropractors and kinesiologist/ nutritionist. But i still get pain, usually if i take 2 or 3 advil im good for the day i feel like i have never had a problem. Also if i stretch a lot and loosen up my muscles i also feel better, but the next day they are just as tight. ive been told to try and gain muscle upper and lower body to help cure the problem, was that good advice? I know when i was 315 i did have fat buy i also had a lot of muscle. thats really why i am curious if i get big again if it will help me The result form the MRI was a slight bulge on the L5