Hello!
Welcome and thank you for asking on HCM!
Regarding your concern, I would explain that your blood pressure values are really low. This could explain the foggy vision and shaky hands. 
Are you taking any anti-hypertensive drugs actually? In such case, I would recommend not to take them until your blood pressure values with be back normal. 
I would recommend having some rest and taking plenty of water to stay hydrated. 
Regarding these frequent episodes, a 
cardiac arrhythmia can not be excluded either. 
I would also recommend performing some tests:  
- an ambulatory 24-48 hours ECG monitoring
- a Head Up Tilt test for orthostatic hypotension
- blood electrolytes
- 
complete blood count for 
anemia. 
You should discuss with your attending physician on the above tests. 
Hope to have been helpful!
Wishing good health, 
Dr. Iliri