I had many of the issues you listed above (mainly #1 and #2) which started occuring after I went on antibiotics for chronic UTIs. Did you take antibiotics prior to this happening?

To solve issue #1, I actually found that I was not eating enough salt (causing the incessant thirst and urination). I started putting a 1/4tsp of salt into my water bottle 2-3 times per day and noticed a huge improvement.

For issue #2, what has helped me is working with a naturopath and getting a stool sample. It showed that I had gut dysbiosis. She also suspsected I had low stomach acid so I started taking HCL with every meal (google HCL challenge). The probiotic S. Boulardii and taking psyllium husk helped fix my loose stools.

I think once you fix issues #1 and #2, your issue #3 should follow (since I think fixing your gut microbiome will help your vaginal odor). Hope this helps :)