Trying to get out of bed today, but everytime i lift my head off the pillow i get a wave of dizziness. is this serious?

No: You probably has benign positional vertigo. You may go to ENT and he will suggest you some exercises of the head which will improve it.

Several reasons: This could be due to several reasons like benign positional vertigo, dehydration, have a middle ear infection. You should see your primary care doctor. He can do a physical exam and perform some basic tests to find the cause. Good luck!