Nothing hellovan intelligent to offer but thoughts.

And to suggest that you try not to worry yourself into a tail-spin. Easy to say but you have a brilliant mind that I reckon you could get it to convince your brain's "worrying" circuits that it's in everybody's best interests that they should stay quiet for a while!
You have family, friends, TE and a string of good doctors. If there is something to find it will be found. In the meantime several terrible things have been crossed of the "possibles" list.
And remember : at any given moment chances are that nothing terrible is actually happening to you. So if you live in the moment and say this to yourself (the above) when you start to "think thoughts" you can calm yourself remarkably effectively.
I also recommend nice music (like those Nature Sounds ones) and nice pleasant art or pictures.

btw, I love your description of your extended family!