God knows all about your disabilities, and He also knows what you can and cannot do at this stage of your life. If it's no longer possible for you to attend church regularly, you can be sure He doesn't hold it against you.
At the same time, I hope you won't let yourself become cut off from your friends at church, or stop taking an interest in its activities. Let your pastor know about your situation (either in a letter or a phone call), and tell him you want to maintain contact with your church. If there are special programs you could attend (such as a musical program at Easter), don't be embarrassed to ask someone to take you. You may be surprised how willing others will be to help.
In addition, make it your goal to grow closer to Christ. No, you can't do everything you once did, but you can still pray for others, and you can look back and thank God for all the good things He has done for you. No matter how old we are, God's will always is for us to "grow in the grace and knowledge of our Lord and Savior Jesus Christ" (2 Peter 3:18).
Most of all, thank God for the hope we have of heaven, because of what Jesus Christ did for us through His death and resurrection. Life isn't easy, especially as we grow older, but Christ's love never fails. Is your hope in Him?