Good for you!
The callouses will come back in no time, and until then...you can cheat and put a dab of superglue on your fingertips. That creates an artificial callous of sorts.
I started out fooling around for about 15 mins at a time 4 or 5 times a day. I got to a point where I was really frustrated because nothing was coming together, so I left it alone for a few days..and when I stopped trying, things just happened. In the past 2 days I've figured out not only the chords for a few different songs, but I've started trying to pick as well....I'm practicing the riff for Hoobastank's ' the reason' today.
I'm so pleased you're playing again!!