Thanks for writing your query.
It will be helpful if give more information on your clinical history like :-
1. Are you diabetic?
2. Are you on medicines?
After reading your post, it seems that you might have suffered from hypoglycemia
You should get yourself clinically examined and investigated.
Following investigations will be helpful :-
1. Blood sugar levels(Fasting and PP).
3. Serum electrolytes.
4. Blood pressure and pulse rate monitoring.
More can be commented after clinical examination and reports of the above investigations.
You should avoid alcohol and avoid missing meals.
I hope this is helpful to you.