Hello, I Am A 24 Yr Old Female, And Starting

Hello, I am a 24 yr old female, and starting last night I've had a squeezing sensation in my left arm. It is not a constant pain, rather it comes and goes every few minutes. Also, it happened suddenly; I was just watching TV and all of a sudden my arm started hurting. I also had a tingling sensation below my left breast, above my ribs yesterday. I recently had two chest xrays done, two ekgs, an echo test, and blood work due to other symptoms I was having. Everything came back clear except for a diagnosis of asthma. I am worried that this new symptom of the squeezing in my arm is heart related. What else could cause a tightness feeling in my arm?