There's tons of info on how to handle a panic attack. Try to read through them, and find what sounds best to you.
Here's one. http://www.anxietycoach.com/overcoming-panic-attacks.html
As for the amount of blood during your period, it can be greatly reduced by going on the pill. Maybe that's an option you can talk to a female you're close to or your doctor about how it might help you.
Congratulations, You're a women ~Be good to yourself.