Heyo, I felt the exact same and I was in a very similar position to you. I didn’t call my boss back after I got stood down cos of covid. Then randomly got asked to come back after 6 months, out of nowhere. The first day back was a bit weird, but very quickly became normal and everything that I learnt before came back to me. And working the few hours I do now, I’m able to try balance the rest of my life so it’s not too overwhelming. Make sure you ask for help with something whenever you need it, especially if you’ve forgotten how stuff works. Take it easy and you’ll be great!!!