No amount of pain-killers will remedy those. If you are seriously suffering from back or sciatic pains, then you should stop any exercise for the time being, stop consuming pain-killers, and you should try to see your chiropractor and ask for an advice.
It is imperative that you start treatments as soon as possible. Back pain can be muscular with joint fixation. But can it be disc related condition. The latter can lead to tingling sensations, then numbness, weakness and pain.
In my experience as a chiropractor, I found many sciatic and back pains come from muscle spasm of hip and leg. Thus get it fixed before these suffering muscles cause you more severe problems.
Chiropractic treatment of the spine (where needed) and deep tissue treatment will help by remedying muscle and joint tension very effectively.