Hey Bert
Congrats on release from hospital!
Spring, then Summer will be here soon - why not keep the bike and therefore your options open?
No hurry eh? Try an easy five minute spin on the rollers, and see how you feel tomorrow. If five minutes doesn't even warm you up, maaybe ten or twelve minutes...
Add a minute each day; you'll be up 95 minutes by April. There will be warm and dry days in April.
Injury and/or overuse will set you back - avoid!
It takes time.
Time flies!
Two years from now you can be in good shape - in five years, a force.
The sun is shining here; we'll see 60s today.