If i don't speak my mind i feel it's a possibility he may die
so you hold on to the belief that ONLY YOU can see/sense his state of unwellness? that he doesn't know this for himself? and that you have the POWER to SAVE his life?
he is entirely capable of managing his own health. he can, if he chooses, make his own doctor appointment. but he doesn't HAVE to. it's HIS life. his health. his misery.
live and let live.
it concerns me that your very first impulse was to "cuddle him". that's a parental/maternal reaction. which indicates you "see" him as a child, not a grown up. and that you feel you can fix his boo boo.
while it may be impossible to go full No Contact as in avoiding ever seeing him, you do not have to engage in conversation. you can avoid topics. you can walk away. suddenly need to go organize the paper clips, or get that "thing" you forgot in your car. you can use avoidance techniques.