Never felt like this before

I have a doctors appointment tomorrow and am going to ask all these questions but thought I’d see what you guys think. I’m 31 weeks and today I woke up not feeling good at all. Not in a sick way, just really off... my stomach today has felt so weird. I don’t even know how to explain it. Never felt like this before. And my back has been constantly hurting for about a week now and it is so bad today. The pain is constant but it will get really bad for a min and kinda go into my stomach and then stop and just ache again. I sat in the tub and it hasn’t seemed to help. When I got out of the tub my head started to feel foggy and When I stand up I just feel like I’m gonna pass out. My vagina is also super stinky but I notice it way way more after sex. So I think I might have bacterial vaginosis. Baby seems to be kicking a lot so I just don’t know what to do. I am just sitting here because when I stand everything gets way worse. Has anyone felt this way? What did you guys do??