Sickkkish help?!!?

ok I have been feeling weird lately. these are my symptoms
1. I have been blacking like evrything out. like whenever I stand up everything goes black
2. my head has been like pounding. like horribly! (n it gets worse everytime)
3. I always feel like...

im going to pass out and I did for a few seconds the other day while I was cutting the grass
4. I always feel sick
5. I always feel like im gonna throw up
6. like I have heat flashes. like im hot one second, then im freezing.
7. I have been like randomly twitching and shaking alll the time.
and it has just been happening on and off for the past few weeks and it just gets worse everytime
does anyone know why this is and what I should do?

I had a similar problem a few years ago.
it could be one of many things

1. a problem in the brain.
there are numerous brain problems that could cause this some very minor some not so good.
2. stress or anxiety.
often these symptoms are associated with anxiety and can cause panic attacks and other problems (many of which you've stated) Blacking out, feeling sick, heat flashes, twitching ect.
3. it could also be a respiratory problem.
not getting enough oxygen into the body could case a lot of problems as there's not enough oxygen in your blood certain cells go into freak out mode.
4. lack of sleep.
your body need sleel in order to regenerate and function properly. without it all kinds of crazy things start to happen

all in all I think you should go see I doctor. I did and for me it was anxiety. easily fixed. good luck, hope you start feeling better soon