Hi, I Walk My Dog At Night For 10-15 Min.

Hi, I walk my dog at night for 10-15 min. On occasion, I suddenly get severe pain in my neck just below the hairline. A couple of times, i felt like I would pass out. I would have to stop and take a few deep breaths before able to continue. It only happens at night. I take longer walks during the day and feel fine.

Should I be worried? Thank you.