severe muscle spasms??

some with TOS have felt as if a having heart attack at times.

My upperbody muscles were in severe spasms at one point - I thought I was having an attack or something very weird for 2 days- but my pulse/heartbeat was totally normal and the worst of the feelings began to fade but the tightness lingered until i came across the chiro i am still going to now 2.5 yrs later.