Any emergency coping tips or DBT I can utilize?

So a while ago my boyfriend of 5-6 months ghosted me, out of the blue, without any explanation. My worst fear is people I love disappearing on me 😱 
So to feel better, I started dating again. I’ve been talking to a few people, but one for a few weeks. We met last weekend, and had a wonderful, magical, magnetic connection. I quickly developed strong feelings…lol. Then this week it felt a little different…. I was worried he’s less interested in me now. But that might be in my head! We still talk regularly, and even had plans tonight to go on a date. But a couple hours before , he cancelled saying he didn’t feel well. Logically I know that he probably doesn’t feel well, and that’s OK. But I panicked… my heart bumped out of my chest. I had spent hours doing my hair and makeup, the works… listening to my romantic playlist on Spotify, etc. I felt so deeply panicked. I thought, “maybe he’s discarding me too”… just like the others do. We texted a bit tonight, then he disappeared. Hopefully he just fell asleep. 

I’m asking for a way to cope or to rationalize my paranoid and INTENSE fear that he has lost interest in me and will vanish. My anxiety over the cancelled plans is off the charts.