I am not a doctor and have no idea if I can help - but I have noticed 2 things: I often get light-headed when there is any change in my meds which then goes away in a day or two. Of course, this is not dizziness to the degree you describe but perhaps good to be aware of. Secondly, hydration helps with dizziness. Several times in my life, when having dizziness spells, just increasing hydration helps - you still need to track down the source but helping yourself is still important. Also - from reading the posts on this site for several months, it is surely the case that everyone's HCM and HOCM symptoms are different. Heart anatomy is extremely complex and, while each of us may have the "same thing" - each of our anatomy still does differ. Track it down and do your best to feel better as well. It is tough to learn that managing symptoms and figuring out what the disease is are two different but inter-related things but if you can get yourself to work on both tracks, it can be helpful. Good luck - dizziness is such a problematic symptom.