His prolonged recuperation following bypass surgery including weight loss and severe insomnia is unusual and should be further evaluated. The tachycardia can be treated with a defibrillator but whether this would be a good treatment depends on what type of tachycardia he has, how successful his bypass surgery was thought to be at bypassing the blockages in the coronary arteries, and what other medications he's on. He would need a comprehensive reevaluation to determine whether he needs a defibrillator and what's causing his current problems. If you do not feel that his present cardiologist is capable of doing this, then you should seek a second opinion with another cardiologist. I hope you find this information useful.
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