Anybody overcome dizziness b/c of standing?

Hi All....

I'm considering whether to apply for an entry level OR position. But I'm not sure I'd be a good fit.

Sometimes after standing for long periods of times I get this "black out" type feeling. Like there's no air and I need to sit immediately then I usually even have a cold sweat.

I don't believe it's nerves as it's happened a few times in church. Sometimes I can say it's b/c I didn't eat enough beforehand but sometimes it just happens. There's usually no warning, one minute I'm fine the next I feel the above. I do have to say it will happen if I feel like I'm getting overheated like a 1/2 into mass they'd shut off the a/c and I'd go from kneeling to standing (slowly) and after I'd be standing for like 30 seconds it would hit.

I really enjoyed my OR experience as a student, but I only got to view a mitral valve procedure for about 2 hrs. I didn't have any of the dizziness then but I was just peering over the top and needed to move out of the way several times. Key thing there I could move around.

It has happened in our school's skill lab and there was another student with the same problem and she was a heck of a lot younger than me! but we both felt in that case that it was too warm and we needed to at least "lean" on the wall or stoop down in fact other students joined us in the leaning... and this was after lunch that's why I'm not so sure it's food related. The skill lab was warm that day so maybe that contributed.

It's not a constant thing but like I said, I never know when it's going to hit. Anybody relate to this or should I just look towards something else?

I have different applications out there, my heart is in no way set on this but in this economy I also don't want to be stupid and pass by a good opportunity especially as I've learned in my life, things that are meant to be happen for a reason so I sort of feel a pull to this but not 100 percent. Confused? Yes!

Thanks for any input.