A few weeks ago i had for 5 days straight strong headaches, i felt dizzy every time i got up from sitting or laying down, and even lost balance.

Dizziness + Headache: Dizziness and headaches often go together. It is often hard to know which is the cause and which is the effect. A bad migraine can cause symptoms a lot like this. Sometimes people feel this way when their blood pressure fluctuates. For some people, the pressure goes down when they stand and recovers when they lie down. Checking your BP would have helped. Hope it does not come back!