sour tasting clumpy watery discharge, burning while urinating, itchy anus, foul smelling urine

so recently I thought i had a yeast infection. my symptoms were itchyness down there, burning while urinating, white coating around vulva and pretty much everywhere down there and a slight foul smell in my urine. I had had similar symptoms before so i decided to use the same treatment i had used last time to treat a yeast infection. I used a generic version of canestin 3 day cream but nothing seemed to change. i though i may have done something wrong so i tried canestin pessary 6 day treatment. i used it in 3 days however as i found it more convenient and the instructions said i could do so. although a few of the simptoms seamed to decrease eg the white coating around the vulva and the burning while urinating and general itching seamed to decrease however i still had the symptoms

At this point i decided to see my gp. she prescribed the canestin once capsule. the symptoms still remain only this time i noticed 2 more symptoms  after having sex with my boyfriend i performed oral sex on him. i noticed that my discharge was sour tasting and tasted abit off. I also noticed it was clumpy sticky and rolled up into balls that looked like snot. I had never had the symptom of sour tasting discharge. 

i am starting to think that i may not have a yeast infection but something else. I dont think I have an STI because ive been with the same sexual partner for nearly a year and for a while i felt very healthy down there. It wasnt until i started using a new deodorant and soap that i noticed the yeast infection like symptoms. I am also worried that i may have given it to my boyfriend as we dont use condoms. is this a possibility? 

I also had a swab test when i went to my gp and it came back negative for thrush. 

can someone help me?