Hello!
Thank you for asking on HCM!
Regarding your concern, I would explain that your systolic blood pressure values are really low. 
I would recommend consulting with your attending physician and performing further tests to investigate for the possible cause of low blood pressure and low pulse pressure: 
- a cardiac 
ultrasound and resting ECG to examine your heart function and structure and exclude possible 
heart failure which could lead to this symptomatology
- a chest X ray study
- some blood lab tests (
complete blood count for anemia, thyroid hormone levels, 
cortisol and 
aldosterone plasma levels, blood electrolytes, kidney and liver function tests). 
Meanwhile, I recommend taking plenty of fluids to remain well hydrated and increase the amount of salt that you take in your diet. Caffeine would also be useful. 
I would also advise you to avoid straining physical activity and staying in hot places. 
Hope you will find this answer helpful!
Best wishes, 
Dr. Iliri