chest pains and bradycaria

Hello. I am 25 and have slight MVP with slight regurgitation. I have been seeing a doctor for palpitations, and he put me on an event recorder. While on that, I noticed it said my hr would drop down to 40's/50's. I didnt think anything of it. I recorded them and sent them in. While waking from a nap, i looked and it said my hr was 32. I went to the hospital, had seven days of telemetry, 3 EKGs, 1 echo, a series of blood work and a 24 hour holter, and everything showed to be fine. I had one low hr of 54 while sleeping and no one was worried. The doctor did say that the telemetry monitors showed fast heart rates at times, but when they got holter results, it showed nothing. Everything was normal.

Two days after they released me, my doctor wanted to see me, and so he told me, everything looked fine, so far. I asked if I could have blockages because my mother, who is 46 just recently had quadruple bypass in april, had a mild heart attack in September, had stents put in and had a TIA and went blind for 11 hours during the procedure. He laughed at me and said I was following in her foot steps*shes a worrywart* He gave me xanax and a very low dose of tropol(he said it would help the palpitations) and if I was having side effects, to stop taking it, no big deal. He wont do a stress test or a cath, he says Im too young. But while in the hospital, before the holter monitor came in, he was worried I might have sick sinus syndrome do to my hr dropping and rising, and mentioned a pace maker. So Im not too young for that, but too young for blockages@@. Anyway, Lately I have been having chest pains. Its like a stabbing, sometimes crushing pain on the left side of my left breast, and sometimes under my left breast. No doctor, not my primary or my cardiologist is concerned.

My questions are(and i know you guys cant give medical advice, i just would like to know what you think)

Is there a possibility that those chest pains arent heart related? I was told that chest pain is bad no matter what from a nurse.

Can a cardiac event monitor be inaccurate since it never dropped that low within seven days of constant monitoring?

Can bradycaria happen every month of not be constant? Or would it have shown on one of the tests?

If I had blockages, would one of those tests atleast give a sign of them?