How do I date casually and not get attached to people?

25M I am a good looking guy and hookups were never my thing. But lately dating has been pretty tough. It's been one failed situationship after another. I have Generalised Anxiety Disorder & Insomnia and my mental health hasn't been well since COVID. I have come to the realisation that I can't be in a serious relationship until I work on myself and resolve my issues first. I only wish to be in casual FwBs. The problem is that I get attached to people very easily (within a meet or two, mostly due to my anxious attachment style) and start having anxiety on the thought of them leaving. How do I get out this cycle and date casually? Any suggestions from fellow queer redditors with anxiety disorders? Thanks.