Bad Friends & Panic

I have recently been reevaluating a lot of things in my life. More specifically, my friends, and I realize that I have a lot of, or used to have a lot of, bad friends. They aren't there when I need them, and they are so selfish, thinking only of themselves. I suppose this mostly irritates me because I am a good friend and do everything can for my friends, so when they let me down, it hurts extra hard. I deserve better.

And on that note, I've been having a lot of panic attacks lately. I don't know why, but it happens a lot. It gets really hot, and it gets really hard to breathe. So then I freak out and I have no idea what to do. I feel so bad. I feel like I'm having one now. What do I do? This really scares me...