what's wrong with me? is it normal?

y
It started when I was 16. I got my nose pierced. I was fine until I got down to walk out the door , my vision went black. That had never happened before. Then I got my first tattoo. That night I was getting tunnel vision. The next morning it was really bad. I had to go in for an IV they said I was dehydrated. Then I got my belly button pierced laying down. Sat up for my lip and got the tunnel vision. Now even getting blood drawn I get hot cold sweat and tunnel vision. 
I'm going to get my sleeve started and was wondering what I can do. I've read that i need to keep hydrated (which is hard. I only drink 2 16oz waters a day) stuff myself before and bring a candy bar. 
Any suggestions on what to do or why this happens ??? 

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