Welcome Crappie, sorry to hear about your friend's dad. I hope he makes a recovery and that his experience helps keep you on track.
I was in the fog really bad last week. My advice is to try to get some fresh air, exercise and to stay hydrated. I was a complete train wreck on Friday, but Saturday and Sunday were a lot more manageable - I think because I was able to spend a little time outside.
Based on your ID, I assume you fish, so I'd recommend getting on the water if you can. This may be shocking news, but you actually can catch a fish without a lip in - I did it on Saturday. Guess what, it's still fun.
If you're stuck inside during the week, you're just going to have to tough it out. Try to take a walk or get some exercise. I've read (and kind of experienced) that caffeine will have an inflated impact, so go easy on the coffee/ soda.
If you get frustrated with friends/ loved ones/ co-workers/ the guy in front of you who can't fucking figure out the chip in his debit card, quietly refrain from punching anyone in the throat. Take a few deep breaths, step back and realize that this frustration might have more to do with a chemical reaction in your brain, rather than a world crushing disaster.
Good luck, reach out if you need anything.