What Causes Fluttering In Chest And Pulsating In Neck?

Hi, I m 45, female, and for the last 8 hours or so, I can feel my pulse in my neck and see it pulsating, and my chest feels fluttery, it doesn t hurt, it just feels like it s moving inside, as well with the heartbeat/flutter and when I lay down, and sometimes still when I sit up it almost feels like someone is squeezing my neck. As I am falling asleep, it keeps waking me up, the pulsing. The pulse in my neck is a big pulse, it looks over exaggerated, you can clearly see it and feel it, its on the right side of my neck. I also have a bit of slight wheezing, all day today too and I have to keep clearing my throat. The best way to describe my chest feeling - like particles are moving inside with the fluttery heartbeat. No coughing. I m afraid to fall asleep, it s been bothering me all night. What could this be? I did sleep the night before in a very cold air conditioned hotel. Could that have something to do with any of this?