wow im almost having an issue like yours. I had a root canal done on an eye tooth (top 1st premolar...bicuspid #5) 5 days ago. I went in on the 2nd day to have the bote adjusted which hurt when the drill hit it! i have pain in the same places as you, severe pain! I even have a bump at the base of the tooth where the root would be. my dds said "oh pain is normal with these teeth cus the have long roots" but im like you, im worrying its a failed root canal cus the pain is sooooo intense for me. i have sensitivity to touch it in the areas you mentioned but now i find myself up at 2:30 in excruting pain...i duno, im thinking i have an abcess or its a failed root canal...please up date this post and met me know whats going on with you
Can you give a little history on that tooth? When was the bridge done, when did the abcess start, what were your symptoms before the root canal?
Based alone on what you have said, I would guess the bridge is too high and taking too much of the pressure of your bite. This is fairly simple for a dentist who knows about occlusion to handle, you should have relief in a few days if this is the case.
I would suggest you go get a second opinion.