Its so hard to figure out at times what the underlying cause may be - you have to play medical detective. I would suggest a full blood work up, including strep, mycoplasma, lyme & co-infections, thyroid, and inflammatory markers (sed rate, c-reactive, gad -65,etc). Are you treating the yeast?
Regarding the intrusive thought- one thing I make clear to my teen daughter (who is currently dealing with one nagging intrusive thought) is that all ocd thoughts are equal on the playing field. Like the above person said, they are just thoughts and there should be no shock value to them, however bad or intrusive they are. Any good therapist should make you aware of that. If you feel uncomfortable seeing someone, maybe try writing down your thoughts and progressing to paragraphs around situations of your thought. Don't write it differently. Try doing this numerous times throughout the day. People with ocd don't act on their thoughts - its the anxiety around the thought that keeps it strong and persistent, and quite the opposite of their character.
Example - if you had ocd thoughts you are gay (or straight - works both ways), you could write down situations of you acting out on gay thoughts. Its the same for all ocd thoughts, whether you have a fear of germs, vomiting, fear of sexuality, fear of harming someone. They are just absurd thoughts. By repeating exposures over and over, it brings down the fear level/shock value.
Hang in there - and trust me you are not alone