Your father has hypertension and Diabeties
Patients of hypertension are on medication called beta blockers which reduce the heart rate and also reduce the blood pressure
Please check if b blockers is a part of ur father's prescription
Feeling suffocating and dizziness my b
sugar related
If sugars are within acceptable range i would suggest you get a ECG echo and stress test done .
Next Steps
get ecg echo and test done