I'm an artist, and I just draw along. Just keep swimming, just keep drawing. Don't swim in circles. However, it's bound to happen.

I struggle with this several times a month. It's one of the worst feelings, like you want to care; you want to feel something but just don't/ can't. Sorry, I don't have any advice on this. I just wanted to tell you that I can relate.

I'm personally autistic and have major sensory stuff so idk how much this might work for you, but I usually like to do things that give me good sensory feelings (ie: blast specific music into my headphones while I walk in the rain without and umbrella) it's not always a happy feeling but it does sometimes give me a calm relaxed feeling that makes it easier for me to calm down and not lock up emotionally (sometimes I do cry but usually I feel a lot better after, sometimes, you really just need a good cry session to feel better)