An idea is making my head spin

Lot of the times, when I get an idea that I think is more than good, my head starts to spin. I get excited about the idea and start thinking about it, and at that moment my brain starts working incredibly fast and it makes itself dizzy. My head starts to hurt and I get this tingling sensation in my body. Almost like I panic as if I need to hurry and execute my idea because I don’t have enough time. But most of the time I do have the time. Most of the time it’s just an idea that came to me randomly. But I can’t help myself of getting overwhelmed by that nervous feeling. Is it excitement? Hysteria? Anxiety?

How to overcome it?