Seriously, not being able to recall the knowledge you know you have if the most frustrating part of this. It makes me so mad that I feel like I should know this but I just don't. So I'm always asking for help, and the minute someone else says "oh check this part" or " you just have to do this" that's when all the info comes back.
Everyone at my job thinks I've got junior level skills, but I've been doing it for 11 years and actually know a lot. But I can never prove it.
At this point I've all but given up on learning and trying new things, because it feels like it's pointless. I don't get excited about anything anymore, it sucks.