Cannot think straight - want him all the time

Sorry in advance because this is embarrassing. I have adhd (formally diagnosed) and it has gotten harder to deal with as I have gotten older. I haven’t been in a relationship in years but suddenly an old flame who is extremely amazing at sex has shown desire to reconnect.

I’m venting here but I wish I could be lobotomized. I’ve wasted my whole weekend dreaming about doing the deed with him in countless ways, I’ve gone from terribly bored and underestimated to overstimulated and way too aroused, I can’t focus at all, and no matter what other interventions I try (meditation, square breathing, do something and just breathe through it, exercise), I return to him in my mind. It’s like a fixation. I’ve orgsmed 10 times this weekend.

I need some advice. How tf do you bring your nervous system down? I’m unmedicated due to issues with my stomach but I remember when I was on adderall it made my arousal worse. What can bring me down without putting me to sleep? Scared of what the work week will bring and lowkey just want to ghost him because this feels so out of control.