New Health Issues Have Me Worried

I recently started noticing a difference in my body. It started with getting sick whenever I didn't eat for a few hours. To the point where I wanted to throw up.

Next was the dizzy spells. I'd stand up too fast or sit down to fast and immediately become dizzy. Now it's almost any time I get up or sit down.

Ohhh and the tiredness. It's to the point I can't get through the day without a nap. My brain shuts down and I HAVE to sleep.

Yesterday I started noticing dark blue veins in my lower abdomen and my upper thighs.. my last period was strange so I thought maybe I was pregnant... I took a test and it was negative.

Now I'm worried it could be something serious, as it's effecting my every day life. Anyone have any ideas?