I'm dizzy and tired but i can't sleep. i'm also recovering from a cold.

Ask your mom....: If she can tell you what she gave you. Sometimes cold medicines can make one feel dizzy. You might also feel dizzy if you are somewhat dehydrated. Drink some non-caffeinated non-sugared fluids to see if that helps you feel less dizzy. Try getting into bed, lower the lights, and try reading one of your more boring textbooks. That will often do the trick.