husband with off again, on again cognitive impairment, stressful

My husband is getting worse with his cognitive issues. He will not give up his phone and has daily problems with it. He now thinks the remote is his phone and vice versa. He wants to change the TV stations with his iphone and gets angry that he needs to use two devices, one for his phone , one for the TV. Now he wants to get utube on his phone which will open up another round of confusion. He is also making appointments with doctors, and others without my knowledge, then he forgets about them or I have to catch up and and either cancel them or go to them, although they aren't needed. He is getting angry with me and thinks I am too controlling. I'm so stressed, I can't keep up with his activity. Thanks for listening I just needed to vent. I feel I'm not doing things correctly.
Cloudydaysue