Welcome to TE. So sorry to hear about all your troubles and glad you're starting to feel better! ((((((Janice))))))
I agree it can be VERY difficult to re-establish a fitness routine once it's been interrupted for whatever reason, especially when it's been such a long time. I'll just say the same thing I told someone else here recently: give yourself permission to be where you are.
Don't feel bad about going for a two mile ride. Don't feel bad about doing it at 10 miles an hour. Tell your mind to STFU if it thinks you're not doing what you "ought" to or what you "used to" do.
Let your body feel the joy. Let your legs feel the joy of movement. Let your skin feel the joy of air flowing past it. Let your blood feel the joy of rushing through your extremities. Let your lungs feel the joy of being fully opened to air. Let your muscles feel the joy of clenching and unclenching and getting fatigued.
Make yourself get out and ride at least three days a week (but if it feels really joyful right away, be careful not to overdo it).
I think it'll come back to you before too long.
Speed comes from what you put behind you. - Judi Ketteler