I'm glad your appointment went well and you are relieved

She may have suggested you see your cardiologist to rule out heart conditions that can cause fatigue. I don't know if you are taking cardiac meds, but sometimes they can be a factor, also low blood pressure...
Her suggestion doesn't mean she thinks you have a heart condition. She was probably making the suggestion out of an abundance of caution. If the cardiologist finds something treatable/fixable you could feel better tho.

I'm glad Pudge is being affectionate