Greyhound Gal, My situation isn't exactly the same as yours. My STBX is trans. We tried to make it work for about a year after he came out to me, but couldn't. During that very long year, I felt as you described. My health really went down hill, and I know it was from stress and not sleeping. I felt just like you said -- total exhaustion. I just hurt all over. I really stepping off a curb one day -- a curb -- and my calf seized up on me. I walked with a limp for 2 months until I decided to do something nice for myself and got a massage. The massage therapist managed to work out that knot and many others. The massage therapist told me that she was shocked at how tight I was and all the knots I had. She told me that I didn't look stressed but my body told a different story. She said to me, and I will never forget this, "I don't know what is going on in your personal life, but are you safe?" I told her I was and that things were just extremely stressful at home. She suggested I find a good counselor to talk to. That would go a long way in helping me feel better physically as well.
I was floored. I don't get a lot of massages, but I have never had a massage therapist suggest that I was so tight and knotted from stress that I should get counseling.
My limp was gone though. LOL!
By the time my STBX moved out, I felt nothing but relief, and I took pleasure in my own company, and I took great pride in doing things like fixing the toilet or the pool pump or changing out a ceiling fan. All of these things showed me that I was going to be okay.
And you know what? I am. Hell, I am more than okay. I am excited for the future. I plan on living simply so I can travel -- a lot. Something my STBX didn't want to do because s/he travels a lot for work.
Stay strong.