Getting worse at chess

I haven't been able to play chess in over a year (I mean really games and studying the game) and started training again this week. Man, the problems I ripped through a year ago are hanging me up. It's like I lost a few billion brain cells these last 12 months. When I'm not playing guitar, which takes up a bunch of time when you do it as a profession, I used to play chess. Now I've got some free time and it's like I'm worse than I was a year ago (and I wasn't that great back then). Anyone else walk away from the game and come back to it frustrated with their performance? Let me know so I don't think I'm leaking brain cells into the air as I sleep!

stopped playing for 15 years came back to the game last year struggling.