panic attack, please help

Kay
Lately because of anxiety I've been feeling like I can't breathe. It happens when I take a sip of water and have a weird feeling in my throats like it's closing. It's like claustrophobia inside my throat... I don't know how else to describe it. 
Anyway, I feel like that right now and I know I can breathe but my brain won't believe me and I need some reassurance right now so I can finally go to sleep. 
Any help at all would be so appreciated. I can't afford to have a panic attack right now.