vaginal tearing

Teryn
hey guys! so my boyfriend and I have been sexually active for about a year now. I'm on birth control so we don't use any other form of protection. I'm usually pretty sore after we have sex because he's about 8 inches. I usually feel some burning from the friction and some internal pain as well as swelling. I talked to my doctor and she said that ice will help calm it, so I do that often... (also i have no std's!) but today, we had sex and i was in excruciating pain for about an hour after - burning, stinging while peeing, swollen, hard to walk, etc. - and it's still very painful to wipe after I pee and to wear tight underwear... i also am spotting a little bit but I got off my period a week ago and mine are always regular so I know it isn't that... I'm scared something is torn or really wrong... any suggestions or ideas on what it is and any advice for how to lessen the pain? 
xoxo