Eating, Drinking on Yom Kippur

Multiple Dr’s (including frum) says a person who is sick must eat and drink normally on yom kippur. What are the rules. Do they make kiddush, if they eat hamotzei do they wash entire hand or up to knuckles, do they add anything in bircat hamazon or Al Hamichyah, do they do mayim achronim, what do they not say in tefilot on yom kippur. Are they allowed to go up torah for aliyah, can they be a baal koreah. Is there an issue if they need to go to hospital on yom kippur, Is there anything else they should be aware of.

If someone is required to eat for health reasons, they don’t make Kiddush. They do say Yaaleh Vyavoh in bircat hamazon. Washing and mayim acharonim till the knuckles.

They shouldn’t lain or get an aliyah.