Prayer in sickness is very easy...

All depends on ur intensions. Allah SWT has made life easy for us, it's human who complicate things.

In your situation, what u can do is put a chair on musallah, in first rakah do qayaam, after reciting surah, u can sit on the chair and perform a rukoo bow down a little, and for sajdah bow down a little more than ruku, for other rakat u don't need to do qayaam. (inshaAllah Allah will accept ur prayer).

May Allah help us to follow Islam properly Aameen!