You have classic signs of depression. Perhaps major depression. The worst part of depression is that it clouds normal thought processes. That's probably why you can't perform as you once did. Find a way to see a psychiatrist you feel comfortable around. Go with a family or friend if that helps get you over the hump. So many high achievers I know go through this. You're not alone, and with proper help you'll get throu…
People always say to get help but how specifically do you find a psychiatrist/therapist? Try them at random from yelp/yellow pages?
The author must have forwarded my email to a colleague (who may have, in turn, forwarded it to further links in a chain - all the intermediary addresses were duly absent from the final referral I got, as should be expected from professionals), because soon after, I got a response from a new contact, referring me to a therapist who turned out to be a good fit.
Looking for a therapist can really suck (I'd had somewhere around eight months of trying at least five different bad-fit therapists before I tried the random-midnight-email approach above), so I figured I'd mention the approach that actually ended up working for me.