AuDHDers, how tf do you calm down?

I have trouble telling what the pain in my stomach is telling me, so I pretty much only just realized how bad my body hates certain sensory and social stuff. It’s as though my insides were on fire and the only way to slightly affect it is to cry (and obvi get away from the noise). I thought it was just anxiety or under stimulation before, but no, those are separate things. I have spent hours today doing various self care type stuff (meditation, being in nature, exercising, mindfully eating, yoga nitra, massage, taking a bath, fun things on the internet, positive stimulus of other sorts, zoning out), and the feeling’s still there. I don’t even mask. How do you deal with having to be in a sensory hell for hours of the day? How do you calm down? Please don’t say drugs.

Context: ADHD often makes people struggle with interoception and being able to relax.