Honestly OP, it’s pretty normal. You have gotten used to working at a different level of abstraction. If you’re really concerned, you could crack open some text

Honestly OP, it’s pretty normal. You have gotten used to working at a different level of abstraction. If you’re really concerned, you could crack open some textbooks and jog your memory. But you likely haven’t forgotten, you’re just stuck into a different type of problem. You’ll be okay and there’s no reason to panic! Panic will just make everything worse. Chill - you have got this and you will be okay.