Thanks for this interesting query.
Your brother has almost stabilized on Insulin
which need to be taken regularly and in the dose on which he is now stabilized. In addition antiplatelet drugs like Clopidogril and low dose aspirin are very much essential like his antihypertensive drugs. He is also on beta receptor antagonist like Metaprolol which should never be missed. His blood pressure is also fine, systolic pressure some times flactuates depending on mental activity, anxiety
. He needs to be reassured that his systolic pressure is fine.
Some more mental rest with meditation
etc will definitely help him.
Caronary blocks especially at two sites can be taken off with simple angioplasty
Present medication he is taking may also decrease his caronary block after pretty longer length of time.
Best possible choice is angioplasty in case you are too bothered about this block and he has symptoms like difficulty in breathing and or chest pain
Best luck !