I get those feelings a lot. My thoughts get going if I don't get a text back. I start watching the clock and my thoughts get worse. As they get worse my anxiety goes up. Like you said a panic attack. I will keep sending messages, to see if they got the first one. I did this with a partner of mine. I wondered if she got fed up with me always sending texts to her if she didn't respond within 10 minutes or less. I would make myself sick if I didn't get a text right back.

I'm sorry you are going through this now. It's hard to fight your feelings. I hope they settle down for you.