Hey there, sounds like you're having one hell of a time and you have the weight of the world on your shoulders.
I wouldn't worry too much about crying. I think it's good for you, a release. I think it's much worse when you want to cry but you can't.

Someone gave me some advice once which really helps me when I feel overwhelmed. It is simply to take things one step at a time.

To look at each of your problems, one at a time in order of priority. Writing them down and seeing what can be done about them.

Devote time each day to do whatever it is you can to alleviate your problems and when you have done this RELAX AS MUCH AS IS HUMANLY POSSIBLE.

I hope that makes some sense to you and I'm explaining myself properly.

I have panic attacks too and sometimes find it difficult to leave the house. Yoga and deep relaxation helps me A LOT. It really helps focus the mind and stop it spinning around and around.

Can you explain a bit more about Mitral Valve Prolapse? I haven't heard of this before. I hope things look a bit brighter over the next few days.
lots of love
Goggledegook xx