Can’t stop overthinking get rid of this anxiety.

I just started dating a guy for the first time in a while. I suffer from depression and anxiety which I’m on meds for although I’ve had to restart taking them because my schedule has made it hard to remember to take them everyday. And so when I’m single I’m fine, I’m chill and cool and doing me and doing the things I like to keep busy. But now that I’m in a relationship I’m noticing the same negative patterns happening where the dopamine and the butterfly feeling is corrupting me and turning me into this overthinking anxiety ridden person. And the worst part is I’ll overthink about something that has to do with him and I’ll acknowledge that it’s prob just me over reacting but yet I still can’t seem to just get over it and be fine. It’s constant and I just don’t want to mess this new thing up. Advice?