"I'm having trouble knowing if they are in my 'head' or real."
That's a familiar sentence to most of us, and something I struggled with for 10 years between initial diagnosis and surgery. Once my surgery was scheduled for a date 3 months out, I began to internally monitor myself even more closely, and had to really fight to keep a level head about things. I was specifically unsure about the heavy leg feeling, right up to the surgery itself, (by which time I had been living with it for nearly one year, and acutely aware of it for six months). It's also hard to know which things are symptoms of heart disease, and which are signs of aging. What I can tell you, is that I now feel physically better than I did 10 years ago, and can objectively say that I find it easy to run farther, faster and more often now, at 42 and 2.5 years post surgery than I did 10 years ago, when I had only 'moderate to severe' AV stenosis and a concurrently enlarged ventricle with thickened walls. The subjective indications of deterioration are factored into the decision regarding the time to intervene, along with the more objective measures of heart remodeling and valve disease progressive against established baselines. To reiterate, make sure that your Cardio knows how you are feeling.
Paul