Dating After Toxic Marriage

Context:

Male (42). Separated 3 years and finally papers signed last January. I divorced her and was very, very happy to be free of her. She was horrifyingly toxic (I suspect bipolar disorder). Anyways….

I started dating again a year ago. Things went really well for three months and then the girl texted me, “I’m not 100% into this relationship and you deserve someone who is,” which caught me off guard, especially since she told me she loved me the week prior.

Took a year off dating.

Now I’m back at it. Had drinks with a new girl last Friday and it went very well but I started feeling very strange. Like fight or flight feeling. Anxious. She joked about how my hands were shaking at one point. The date still went extremely well and I’m supposed to see her tonight.

I just don’t understand where this feeling came from or why and I want it gone. It’s like a slow burn feeling of catching yourself almost falling down a flight of stairs or something.

I meet her in like 2 hours. lol