Meds not working good any more?

Doc has me on Vic ES 7.5 and take 2/day for past few months--bad back. Now had a flare up and pinched nerve in back, he said take 1 addtl/day for 7 days. Now day 9 and back to 2/day...and the pain is bad. Should i take 3/day or call again and ask if its ok? Or should i suggest something stronger? I know my tolerance is probably going up. And I know they arent good for you.. I am just now starting a strength training program to increase my core and strengthen my back. But injured a preexisting problem about a week ago while working and pain level went up.. Any suggestions without preaching~