Yep - been there many times. It helps me to think about how much worse the day might be if I hadn't had that fleeting moment of joy before the aggravation started...
As for me...I'm having a great day. Except for this stupid thing on my back. *LONG POST WARNING!*
For at least 2-3yrs I've had a golf-ball sized lump on my back. My ex had the same thing (although hers was larger) and it was diagnosed as a harmless fatty tumor, so I assumed the same was true for mine. Well Monday it started swelling and itching. Now it's swollen to the point where it's pushing on my back muscles (or something else in there), and it stings and feels like it's about to pop. There's also some reddening around the area. I thought the swollen area was puss, so I made an emergency trip to the doc yesterday. She said she's seen it many times - basically there's a break between 2 layers of skin/tissue, and fatty tissue is protruding from it. Some people live with these their whole lives, some people get an infection and need to have it removed. But here's the kicker - when I play my strap rests right on top of it. In order to remove it they'll have to slice it open, pull the fatty tissue through the incision, slice it off and stitch me back up. Stitches would be in for 7-9 days. There's also the possibility that it's infected enough for them to have to leave it open, which would obviously delay the healing process.
We literally just wrapped up recording our first EP with Brett Hestla, and need to get a couple of practices in before our next show (next Friday). So I took the only feasible option...take antibiotics, hope it pops and/or the infection goes away, then schedule the procedure for next month when we'll have a span of about 3 weeks with no shows.
So now I have what amounts to a golf ball pushing on my insides when I sit down, that's itching, stings and is scaring the cr*p out of me thinking about the prospect of having an open wound with packing in it. And I can't play bass standing up...until/unless the swelling goes away, I'm not to have a guitar strap on. : /
/rant