Hi, i wasnt sure which category to place this in, so seeing as im uncertain, i thought id put it in General Health.

For the past 3-4 days, ive been experiencing extreme nausea (On the verge of being sick) In the morning and at night. When i lie down, i feel pressure building up in my head and i have to keep changing position. Im also getting sudden sharp pains on the left side of my head, feeling weak and very tired.
Can anybody help me out? Im 16 and always thought i was in good health. Im worried, and if it continues i will see a doctor, but until then, does anyone have any ideas?
Thanks, any help would be much appreciated!