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Weight is like bank account / The amount in account comes down when you withdraw more (physical work) and you deposit less (eat less). If the weight is picking up, it only means – the exercise is not enough / the food is more / or both.... Probably, he is not doing any physical effort after the attack...
See a good dietician – he has to reduce the quantity of his food and change the quality too. He needs regular exercise.
Episodic rise of pressure may need a separate set of investigations – conditions like Pheochromocytoma
have to be excluded...
Discuss with his doctor... The treating doctor alone can suggest based on his assessment of the situation.
Wishing speedy recovery