Hi there ~
Relax, there is a reason why your body is acting the way it is. And you seem to know it. I would think of dehydration
as my first bet, however you know your body better than anybody and you should visit with a physician who will take a complete history to determine what is going on. I hope there are no over the counter medications or substances of abuse involved. I also hope alcohol is out of the picture and you are not using any other prescription medications. If these are all ruled out and many other things, it seems like you have a panic attack
. I recommend that you get help of a qualified psychiatrist
who might also refer you to a psychotherapist or a psychoanalyst to determine the root cause of your problem. I am sure medications for psychiatric reasons will help but you need professional consultation.
I hope this helped. Take care and have a lovely day !