Hi am new to this forum, but I need some insight from you guys. Please and thank you ahead of time. And forgive me if I posted in the wrong place and for this post to be too long.

I just recently developed (self-diagnosed) panic attack.

I am a 26 year old male. In my last relationship, which ended 3 years ago, I dated a girl for for almost 5 years. I wanted to marry this girl but she cheated on me, fortunately or unfortunately, with a very close friend of mine during senior year of college. Every since then, I didn't trust people easily, in addition to myself already being an INFP (which don't tend to share their inner thoughts or emotions with someone easily).

Fast forward 3 years, I don't keep in contact with my ex-gf or friend. I even actually stopped hanging out with those group of friends and made new friends slowly over time. I have friends I can lean on now, I am totally sure I am over my ex and I started dating again.

So I met this new girl through a friend, and we hit it up on the first date. I was excited about her and went of a second date. We kissed on the second date. When I went home that night, I couldn't sleep. At first I thought I was just excited about her. But for the next 3 nights and days, I still couldn't sleep. My heart was racing, my head wouldn't stop thinking (about the new girl, negative and positive thoughts), lost my appetite, and felt like there was a black hole in my gut. Without sleep, my mind just went crazy. I have to go to work too, and I felt like was just about to break down and die.

I eventually spoke to a friend, and he said I was just "lovestruck". I thought he was right, and talking to him made me at ease. I slept so well the 4th night and went on a date with the new girl the next day.

The night after the third date, the "attack" come back. The same symptoms as before.
I am convinced that I don't care if this new girl doesn't end up with me. But am I wrong? Could possibly the emotions from losing my ex-gf somehow transferred to this new relationship? Am I afraid of losing someone I love? Am I am really just lovestruck? I have felt something similar after breaking up with my ex, and that lasted two weeks. Ever since then I had not felt it again.

I want to face my fear. I want to tackle my fear. I want to solve this problem. I want to make myself better. I am an athletic person, and I push myself to the limits all the time mentally and physically. But panic attacks are a beast. Please, I need some advice.