I would defiantly get in to see a cardiologist. And you are right, a second opinion is always a wise choice that way you have someone who has back up the first diagnosis and treatment course. I feel for you. A physician should not leave you hanging like that. My Cardiologist's nurse works me into his schedule at a minutes notice without any problem. I think it would just go to show of the kind of physician and his attitude towards his patients. Has your husband ever had any problems with this cardiologist? Maybe see if there is another one in the their group that you could switch to and review your record.
As for my mom she has been over weight pretty much all of her life. She has Mitrovalve Prolapse and has to have 4 valves replaced. Always had chest pain the doctors said that she had to lose weight before they could do the surgery. So she had gastric bypass in April of 2004 and now she is weighing around 150 pounds. She jogs everyday and feels great. She hardly ever has chest pain, unless she is under heavy stress. I guess this is why she is putting off having the surgery.