In all the above-mentioned cases...
In all the above-mentioned cases, the pilgrim in question is relieved of his obligations, barring intimacy with his wife. However, in both Hajj and Umrah, only after he has completed tawaf and sa'y can he be absolved of the responsibility. Rule 447: During Umrah, the pilgrim may become sick. Accordingly, he dispatches an animal for sacrifice. He then recovers, so much so that he is now able to continue with his journey to Makkah and arrives there before the animal is offered.
In such a case, he must sacrifice it himself. Assuming that it was Umrat-ul-Mufradah, his obligation is only to complete it. If it was Umrat-ut-Tamatu' and he was able to complete its ceremonies before the zawaal of the day of Arafat, he should do so; otherwise, his Hajj should evidently switch to Hajj-ul-Ifraad. The same rule applies, if he had not dispatched an animal for sacrifice, waited till recovery, and was able to continue the journey.
Rule 448: If the pilgrim falls sick and sends the hady, then he recovers that he feels he could perform pilgrimage, he should join in the ceremonies. If he fulfils the requirements of the two wuqufs or, in particular, the one at Muzdalifah, he will have performed the Hajj, as stated above. He should complete the ceremonies and offer the hady. However, if he fails to get there and no one offered the hady for him, his Hajj will turn into Umrat-ul-Mufradah.
However, if some one did the job for him, he will be relieved from the restrictions imposed while in a state of ihram, except for intimacy with his wife. It is obligatory on him to perform tawaf and sa'y, in Hajj or Umrah, to resume sexual relationship with his wife. Rule 449: If a person is prevented from performing tawaf and sa'y because of illness or the like, he can hire an agent to perform them on his behalf. However, he must say tawaf prayer when the agent has completed the tawaf.
If he was prevented from proceeding to Mina and performing its ceremonies, he must deputize somebody to perform rami and offer hady. Then he must shave his head or do taqseer and send his hair to Mina, if possible. He should then complete the other rituals. Rule 450: If the pilgrim is prevented from performing pilgrimage, then dispatches the hady, but before reaching the appointed place, he complained of headache, it is permissible for him to shave his head.