For 3weeks i been having this lighthead/floaty feeling in my head & headaches. it's almost constant. what could be causing this?

Constant Headache ..: 24 y/o Female with 3 week history of having lightheaded/ floaty feeling in the head & Headache. It's almost constant. What could be causing this? As young lady lightheaded/ floaty feeling could be attributed to things like Anemia due to heavy Menses or even Low BP, even Viral Syndrome but Constant Headache raises a flag to see PCP asap. Plus get Eyes checked