A few days ago, I was brushing my tongue but gagged severely. When it happened, I got this major pain in the back of my head. If felt like a major throbbing sensation from the top of my neck to that spot on my upper right scalp. I've been having that throbbing sensation here and there and it occurs sometimes when I tilt my head to the side. I also feel pain that radiates to that spot on the head when I touch the top of my neck. Can it be a broken blood vessel? I didn't feel anything pop and except for that throbbing sensation, I don't have any other symptoms. I've been using acetaminophen alternating with ibuprofen for the last 3-4 days