***Warning TMI ahead***

So I have been with my girlfriend for over a year now and I have not slept with anyone else. Back in May we were having sex and I noticed it started to burn during but didn’t think anything of it, perhaps just some dryness. It went away for a few weeks and then happened again while having sex and this time it didn’t go away until two days after. I treated myself for a yeast infection just to be safe and started to feel better and after about a week we tried again and it still hurts. Last night we tried again and it was fine until I woke up this morning and now l am really starting to worry. I have an appointment to check it out in two weeks but any advice to help ease my wandering mind would be great! What is going on with me?