Please help. Pain!

Hailey
Around March 30th, my boyfriend and I were messing around and he stuck a finger in when it wasn't wet and his fingernail felt like it scratched me inside so I told him to take it out and we didn't do anything that night after that. The next morning I got up and was running my typical 5 miles, but at mile 3 my hooha started having a sharp pain. I went pee and it burned. This stayed like this for the whole day. I knew it wasn't a yeast infection because I've had two of those and there wasn't any oder or change in discharge. The day after that, it was just itchy but stung when I peed. Its been nearly a week. It still itches all day but only stings when I pee maybe two times through the day. I was thinking that if he scratched it then it was trying to heal and thats why it was itchy. If this doesn't get better soon I'm going to the doc. Any ideas what's going on?