I am thinking that you may not have infection but rather vaginal irritation
. I would suggest seeing a Gynecologist so she can examine your vagina for any lesions or discharge. It will also be important for her to do a speculum examination to examine comprehensively.
Previous UTI antibiotics may have altered bacterial community (normal bacterial flora) in the vagina thereby causing changes that lead to your present condition now. Vaginal suppositories or ointment may be needed to resolve the problem.