Welcome, @emo44. I'm excited for you that you have an appointment for apical hypertrophic cardiomyopathy in September.
I moved your question about feeling lightheaded off and on and your concern about this being dangerous to this existing discussion:
- HCM and Head rush sensations https://connect.mayoclinic.org/discussion/head-rush-sensations/

I did this so you can read what others have posted and connect with members like @Sensation @onewholovesrock @mistymopps3 @sheim @rrowner2 @angiev18 @archer and more.

If this symptom of lightheadedness is new and concerns you, you may wish to contact Mayo Clinic through the patient portal. Have you created an account on the portal called Patient Online Services?