pain's going away...how do i go about this now?

[newenglandchick]

well my mri came back normal. nothing is wrong there. my doctor thinks it is muscle related. i saw the company's doctor the other and was told it isn't work related. i really wasn't surprised they would think so. my doctor said it is going to be near impossible to prove that work caused the muscle problems.
i did find out that i can go see a specialist. my doctor and i find it a little weird that my worst pain is caused by sitting then shoots to my legs. so hopefully a specialist can tell me what is going on. something is causing the sciatica on the right side. i'm not sure if it's the muscles in my lower back or the muscles in my buttocks. physical therapy has been deep tissue massaging my back and butt area(right side mainly). after they do i am able to sit for 30 mins w no pain. then as time/days go by, the time i able to sit before pain starts lowers. i joked and said my therapist needs to be by my side all the time to give me a deep tissue massages. i do all my exercises/stretches i was shown by PT. so i'm not sure why i can sit after the massages but the stretches not so much or that long. hopefully a specialist can assist in what is going on or have an answer.