I went to my cardiologist yesterday because I felt pulsating in my head, saw it by my knee and then in my neck. I know I have an anxiety disorder (looking for a therapist) and my muscles are tense and painfully sore. I also saw an orthopedic last week because I accidentally hurt my elbow. 

The orthopedic said my knee was muscle. I didn't tell him about my head.

The cardiologist thinks my head and neck are me feeling my heartbeat and couldn't explain the knee.

Now my armpit area is doing it. It's physical and I can put my fingers on it. I think it's all muscle tension related. 

Has anyone else experienced this?