do i have bv and how to treat it?

hi i’ve been experiencing some changes in my body lately. my pee smells different like sometimes fishy or like ammonia ish. it’s never hurts or burn when i pee tho. which kinda concerns me bc it’s never been like that, this change happened about 2-3 months ago but just recently within this last month sex has been very uncomfortable for me. i’ve been with my bf for almost 5 years and all of a sudden it hurts having sex it’s very uncomfortable and has kind of a burning feeling. so i started doing research and i think i have some symptoms of bv. i know it’s not a uti or yeast infection bc i’ve had those before and this doesn’t feel the same. during the day i never feel any pain in my lower back or on my cookie only during sex i feel pain. i also drink a lot of water i eat relatively healthy and workout a lot. i’ve never changed laundry detergent or wear thongs i always wear boy shorts style underwear. also i always make sure during sex it’s lubricant so i don’t think it’s a friction burn or anything of that sort. i don’t have any insurance so honestly i think seeing a doctor won’t be happening anytime soon. i’ve seen that metronidazole is usually prescribed when having bv and was thinking of just buying some and taking the usual dose to hopefully fix my problem and then start taking a vaginal probiotics pills after to maintain it. do y’all think that’s a good idea or have you tried anything else to help your problem?! please lmk i need all the advice i can get!! thank you<3