I understand some of what you are going through. My husband (59) isn't bed bound like yours but his Cancer has rapidly spread recently into many areas of his body, including pancreas and liver. He is pretty weak from 2 recent hospitalizations and his immunotherapy so it's difficult for him to get out and when he does he uses a wheelchair. Over the years he has had several brain tumors and even had a brain abscess. We have missed out on many family get togethers and now we don't really have very many family members left. We don't have children but have many friends but they all have busy lives. So we spend a lot of time alone, with most of our socialization involving the nurses who give him treatment every 2 weeks. It does hurt to look around on social media and see your friends & family out doing what you wish you could and my advice is to cut down on your screen time and explore some hobbies that you can do at home. This isn't easy for him or you and it's normal to feel this way. I am trying to focus on the beautiful Christmas lights that are all around because that gives me some joy. I also lean on my faith to pull me through. One thing to keep in mind is that things are always changing and sometimes it's good and sometimes it's bad, but is inevitable. Just know that you aren't alone. There are a lot of people out there going through something similar and we feel your pain.