help!!???

Symptoms:
Met a new boy in June 
    (currently bf)
Had sex
    (felt funny/ body change literally the next
     day after)
Same month I got a yeast infection
    (Solved with vaginal gel by GYN)
Complained to GYN that i felt:
   1. Loss of sex drive
  2. Couldn't self lubricate as we as before
She said it could be stress, it's all in my head or a change of diet, 
   ( I eat well, and I'm not necessarily
     stressed)
During sex, I started to use lube & even that wouldn't help, 
Also sometimes gets very painful and dry mid intercourse 
I KNOW MY BODY ITS NOT IN MY HEAD. 
If anyone can suggest what it might be or what test I can take to find out what could be the cause of me having little to no sex drive, not being able to self lubricate, which was never a problem, I'm 21. 
Thanks in advance