My wife has cancer and I need some help please?

Hi, I'm 35 years old and have been married to my wife for 6 years, been together for 12. She has stage 4 cancer, has had it for a few years now and it does not get easier. She hasnt been responding well to any aggressive treatments, and is sick in bed except saturdays and sundays. I dont want to sound rude but what I am about to ask I DO NOT need any rude comments. She was never a jealous person but now whenever I look she starts crying, and says it makes her feel so ugly because well ya know she lost her hair, eyebrows, eyelashes, etc. She does have wig, fake eyelashes, etc but that still doesnt change how she feels inside. I try so hard not to look and I really dont do it on purpose. I think she is the most beautiful woman, even bald. She is my hero. I try and compliment her all the time, make nice dinners, surprise her with gifts. I dont know what else to do. I hate making her feel this way. Of course our life has in hault...except once a week but even then its hard for me bc I know how sick she is. I tried explaining that to her which was a bad idea bc now she feels worse about herself. I am still attracted to her, but am more scared about losing her. I do masturbate a few times a week but its more of a stress reliever. So has anyone dealt with this? Or anyone ever had a jealous partner? I do understand why she feels the way she does I just wish that she could see I dont really care about other women....I might still glance, but I honestly could care less...bc her being sick made me realize what really matters, etc.I just dont know what to do. It tears me up inside. We have spoken to counselors, her doctor, etc. They have all said its the strong treatments shes getting, and of course bc of how her appearance has changed. Any advice would be greatly appreciated please. Again, I dont need anyones crap with stupid answers.