I don't know if it's stress, or anxiety, or what, but I'm usually a fairly thick-set guy (read: fat). No but seriously, I've been fat a couple of times in my life, but from my mid-20's onwards I've just been a normal size, but with a fairly big frame.
Then out of nowhere I've got kinda... scrawny. I've still got the same frame of course, that never changes, but I have no 'meat' any more, and my rib cage is really showing
This would normally be awesome news, but it's left me kinda... flubby, with like a ring of loose fat around my waist. Think of a king-size duvet cover over a single-size duvet, you know what I mean?
I've got no definition or anything. Not that I had any before, of course, but at least before I looked kinda 'filled-out', ya know?
Get to a gym, fill that shit out with muscle!