The key is too eliminate possible (could-be)s.
.
Half the symptoms you mention sound like low blood sugar.
Fyi - not all bloodsugar meters take the same reading as
doctor's blood sugar meter.
.
One of the meter series that do it right is one touch.
I use the ultra, but the fast take works fine too.
The strips are $$$, especially with no rx.
If no rx, you can usually buy them on ebay for $.45 each
compared to $.90 at the drug store.
.
Other issues could be cause too - but worth looking at
possibility of diabetes. If he's below 65, thats a concern.
If he's falling down and very sweaty - thats big indicator
he's 35-45 bloodsugar, which is insulin reaction.
100% orange juice works best (for me), instead of
food or sweets.
But low blood sugar could also be from hypoglysemia.
Some people eat a few too many carbs , then their insulin
over reacts 30-60 min later, and drops like a bowling ball.
.
The meter is about $65 and small bottle of strips $45.
Highly recommend he tries this for a while, to verify
or eliminate low bloodsugar from being the problem.
Love, bill11931