For the past 2 days every time I stand up after sitting for a while I get very close to passing out. Once I started to collapse but was able to slide down to the floor and lie down for a while. I lose my vision and get tingly when this happens, and if I don't reach out to hold onto something and put my head down I think I would fully pass out. I also have a bad headache and my neck muscles feel sore.

What could be causing this? And should I go to Urgent Care to get checked out?