Super bloated...

So I've been on my period/spotting for about three week now (my doc knows, I'm going to go on a new birth control in a couple of weeks) which is causing me to be bloated

I'm also on a medication called lithium (actually slowly transitioning off and getting on some thing else) but this medication also makes me supper super bloated because it makes me retain water easily and become super thirsty

I feel like a ballon most of the time and it's bringing me down

What can I do to get rid of all this bloat?

Just and FYI I CANNOT take diuretics with lithium and I also drink 1.5 gallons of water a day (not kidding I'm super thirsty, yes doc knows)

Edited to add: also wanted to add that I don't eat much sodium, I never salt my food (unless it's cauliflower) and always chose foods that have the lower sodium option

I'm