Maybe im too freaked out?

I feel silly for posting this really but I'm actually kinda scared to shower now that I'm 13 weeks pregnant and lightheaded/dizzy literally 24/7 it feels... I've passed out 2x in the shower now with warm water and luke warm water (which sucks bc winter 🥶)

I'm sorta freaked out that it'll happen like every time I go to shower. I've got two seats in my shower cause how it's made and I'll switch between them instead of standing to wet and rinse my hair / body but I still feel incredibly light headed and just can't stand to shower.. heck I can barely stand for more than a few minutes without feeling awful.

I do drink plenty of water and I do eat as much as my stomach can hold plus a little more ..

What can I do to try and reduce this? My blood pressure seems to keep dropping each week as well and my ob knows but doesn't seem worried at all. Im also like 103-4 lbs and 5'7 and he doesn't even seem worried about that.. I'm switching obs tho... Idk if any of that info would help.