Gee, that is scary. I've been through similar, but different, of course. I can't know exactly how you feel. I'm still perimenopausal, but have terrible uterine cramping from endometriosis and adenomyosis, plus a few other things like polyps and fibroids. It could be as simple as a fibroid or polyp, lets hope. Maybe something like adenomyosis could cause your uterus to contract post menopause, but at least it's curable, even if it does require surgery. I've had a hysteroscopy for a uterine abnormality and its relatively simple, so that's good. I know how scary it is, that I do. And there's nothing anyone can say to ease that, but I always tell myself I'd rather just know what I'm dealing with, so I can take appropriate action, rather than keep guessing and worrying. That's just me, maybe. But it feels good to at least be moving forward is what I figure.
I've also had nasty chest pain that sent me in for all manner of tests, ekg's, holter moniters... Ugh. Turns out it was costochondritis, which is a simple, if very painful, injury of the cartilage between the ribs and sternum. No more going for jogs for me. Lol. Too top heavy.

Talk about a relief, though. Still, I was so glad I did the tests, so I
knew.
I'm glad you are getting things checked out. It's best to be safe. And you seem to have a wise attitude about it. Putting it in God's hands is sometimes all you can do besides going to the doctor. For what it's worth, I'll be praying that you health issues are relatively harmless and that the pain you are dealing with just melts away.