Are oral thrush, dry mouth and vaginal thrush common ARS symptoms for HIV? & what are the chances that I contracted HIV from RECEIVING cunnilingus?

Unlikely. You do need to see your physician to clarify your concerns. You need an evaluation to answer the question of why you have thrush. While you may get an HIV test, there are other things that need clarification. This may not be a major problem but it is best to check it out.