Terrible Service from Internist

This is most probably the worst Internist ever - a Dr that honestly does not care. After spending a week in hospital, doing every heart test possible (and thus exhausting my medical aid in the process) - as he was convinced it was my heart!) - he still could not give me a diagnoses. And it was definately not my heart! Back at work the next day, after 2 days my symptoms were back in full flare, I called him for help. Well here we are 5 days later and he still does not bother to call back?!! Is that honestly a Dr I should look up to? I need to get my problem/health sorted and he dies not care.