I'm a 19 year old female.

When I stand for long periods of time with loud noises around me I get really weak and feel a bit faint and dizzy. Everything gets darker and sometimes I see really tiny spots, I break into a cold sweat and everything sounds like its coming through muffled speakers. And sometimes I shake a little. 

It goes away after about a minute and a half and sometimes if I drink water, after it's gone I feel really hot for a few seconds before feeling fine again.