I'm not sure exactly how to describe, tbh. But I'm really stressed out at the moment, with a very sick parent, and I am abroad trying to get home.
When too many other everyday stresses mount up and I get overwhelmed thinking about it all (but still things that need to be dealt with because they are important...not sweating the small stuff) I get this horrible weird sensation up through my abdomen 
Maybe pain is not the right word as it's not sharp or a dull ache - but it's a definite horrible physical sensation that makes me need to curl up and bring my knees into my chest. It's physically extremely uncomfortable to stand up, almost like a protective layer of 'something' has disappeared from the front of the body
I wish I could describe it better!
Wtf is this? Has this or similar ever happened to you before?