Little concerned

First time tripping yesterday and had a pretty bad time during the most intense parts due to a feeling in the left half of my neck making it seem like my veins were shortening and pounding. The rest of the experience was great, but the feeling in my neck never went away, only lessened.

Fast forward to now, 16 hours after start time, and my neck still feels constricted, and like my veins are moving in that part of my neck. My left side feels almost a little numb.

Wondering what this could be. I looked into vasocontraction and took some ibuprofen, but it didn't seem to help. Any ideas?