Oh, I'm sorry @utopia That sounds very anxiety-provoking.
A tough situation for you to be in.
You will be in my thoughts & best wishes.
I had major unexplained weight loss (still not Regained) - Which prompted tests, which found internal blood loss & very low Iron levels.
I don't see how Tuesday's procedures can or will discover the causes.
Certainly the cause of the weight loss will remain unknown.
Best Wishes,
Adge