Hi,
really sorry you feel so bad but this is classic anxiety & panic attack stuff.
You need to calm down your breathing by slowing it a little & breathing from your lower abdomen as it sounds like you may be hyperventilating which will just make you feel worse. Sounds like you are feeling very agitated & I know when these fear panic cycles start it can be hard not to let it escalate but just try to be as calm as you can & the panicky feelings will subside. Sometimes it helps to just accept the physical feelings you're getting & not fight them, just tell yourself over & over 'this is just anxiety, it's uncomfortable but not dangerous' . If you try to let go of the fear then you break the adrenaline cycle that you're in.
I strongly suggest that you read one of Claire Weekes books if you haven't already & another great website is 'No More Panic' which specialises in anxiety & panic attacks-you may already know about this site but if you don't it's well worth a visit.
Hope you feel better soon, many of us here understand what you're going through.
Seffie xx