What exactly is nausea?

So almost two months ago i had food poisoning, at least i think it was food poisoning well i woke up at like 12 in the morning and i didn't have dinner that night and for about 2 hours i felt really bad nausea and i felt like i was going to throw up...

Okay, so my stupid parents won't take me to a doctor. So, can you guys figure out whats could be causing my nausea? I mean it's been going on for so long now. About 4 weeks, and I have no idea what's causing it. It seems really weird to me because everyday...

It started during mid-term exams, I ate KFC and studied before going home, eating fish and throwing up. I blew it off as stress even though I have never had any stress problems before and even when I was stressed, I never got nausea ever. In fact I almost...

I have been feeling nausea for about 2 wks, thinking I might be pregnant I took a couple of tests (6, actually, all spread out through these 2 weeks) and they all came up negative. I am currently exclusively breastfeeding my 4 mth old and I did have...

This same thing was what used to cause me to vomit when I was younger. After a few years, it went away. These past few months I have been hit with many stomach viruses and am pretty much prone to vomiting at the drop of the hat, so maybe that's part...

Whenever I get sick I feel nausea in my head. When I throw up the feeling of nausea is in my head. I'd say about 99% of the times I feel nausea it's in my head. (Only in the absolute worst cases of food poisoning did I feel it in my stomach too.) But...

Over the past several months or so, I've developed these awful headaches. They seem to occur either when I don't eat a meal on time, or if I don't drink enough water in the morning. The longer I wait to eat, the worse the pain gets. The only thing that...

Ok, for the past few months, I've had recurrent low back pain in the kidney area, and I've felt bloated and uncomfortable. About 3 months ago, I had a UTI, my first one in years...then about 2 months ago, I starting getting pain in my right hip, which...

i sort of have an anxiety disorder but havent been diagnosed yet...But my problem is, is that I have always been paranoid, and have had phobias, such as of cancer and diseases and stuff like that, plus pessemistic with things such as relationships with...