My vagina has changed since been having a lot of sex and I'm starting to get really bad deep pain during intercause I've never had this before and I am starting to get thrush quite a lot, my vagina is very swollen inside and doesn't feel normal... I have been tested I have no sti I really don't no what's rong x

I would take a trip to your Doctors or if you have a well women's clinic in your area there, if you have thrush you'll need to see a doctor ( if in UK) for that or pay over £12:00 for the canesten duo at a chemist, but is free from Doctors, or the STD clinic at any Hospital;

I highly recommend consulting a GYN and abstaining from sex until you get this figured out.