I've been sexually active for nearly a year, and ever since the beginning i've had problems with it. I know it is always sore the first time, however every time is like the first time for me. The pain was manageable though, It was uncomfortable at the beginning of every sexual encounter I had with my boyfriend (my only sexual partner) but after a minute or two i'd adjust and it would be fine. But then this cycle would repeat constantly...
then i was given a course of antibiotics, and developed a heavy bout of thrush. this made sex unbearable. I've been to doctors twice for cream and for an oral pill, but i can't get rid of the thrush, it keeps coming back. After sex, my vagina is very inflammed, red, and painful, and sometimes I have a horrible stinging sensation afterwards, and difficulty passing urine. I also have a history of UTIs. 
I've had sex with one person, I'm on the nexplanon implant and I've been checked for STIs. i know that these are all the symptoms of thrush, but i cant get rid of the pain :( please help.