Welcome at HCM
    I have gone through your query and being your physcian i completely understand your health  concerns.
for how long he is  suffering from it? any other associated problem? like 
diabetes or hypertension? any medications he is using?     
      as far as his case is concerned we need to look at all the possible causes. At least organic causes should be ruled out.
 if i am ur attending physician i will look whether u are diabetic or not since hypogylcemia can give u tiese symptoms.
    Apart from it , there is need to look into your meds  too since diuertics use can give this problem.
   i will look at ur blood sugar status ECG ECHO LFTs i will also screen you for 
Addison disease too. 
After evaluating you for all these causes i will be able to offer you definitive  treatment.
      Meanwhile stay calm continue with your medications , do get regular BP monitoring and chart it. if possible get at least two readings of ur blood sugar too with one fasting and meet your doctor.
if u suffer from it again do get some sweet candies  at once, as we dont know yet but 
hypoglycemia is dangerous.
stay calm 
get well soon
 Hope your query is adequately addressed if you still have any feel free to ask
   Regards
Dr Saad Sultan