He intended to do tamattu’ but after ‘Umrah he fell sick and went back home, and did not do Hajj
Question

I went to do hajj tamattu’, but after I did ‘Umrah, I felt pain and swelling in my knees and I could not move or walk. I went to the doctor and he advised me not to continue with Hajj. After that I came home and did not do Hajj. Do I have to offer a sacrifice?.
Praise be to Allah.If the situation is as you describe and you exited ihraam following ‘Umrah and did not do Hajj, and you went back to your homeland before entering ihraam for Hajj, then you do not have to do anything, because the ‘Umrah ended when you did it and exited ihraam, and you had not yet entered ihraam for Hajj. 
And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions. End quote. 
Standing Committee for Academic Research and Issuing Fatwas 
Shaykh ‘Abd al-‘Azeez ibn ‘Abd-Allaah ibn Baaz, Shaykh ‘Abd al-Razzaaq ‘Afeefi, Shaykh ‘Abd-Allaah ibn Ghadyaan, Shaykh ‘Abd-Allaah ibn Qa’ood.