Why im i so sleepy and been having a lot of dreams and headaches when i wake up and not been able to go to sleep?

Try getting something called melotonin. You can buy it at any walmart. It is a natural sleeping pill. Melotonin is something youre brain releases to tell your body it is tired and allows you to go to sleep. Sometimes your brain doesnt release enough.

This isn't really the place to ask as this is for school related questions but I will say you're not alone. You can take advil for your headache and maybe look into sleeping pills. 
If you want a natural way to fix it without pills I would suggest making sure you're eating enough and having enough water.

About the dreams... No idea, I have the same problem with nightly nightmares, if you find a fix let me know