I too had some major medical issues back in October, about 10 months into my bass journey. What a major set back. It was’t til mid Jan that I was finally able to start playing, with some regularity, but it still took til late February for me to be full back in, and start back with the Talkingbass courses I left off with.
The good news, I had just finished his Scales essentials, and was 1/2 way thru the Chord Tones essentials when I went to the hospital. When I started back in Jan, I was super suprised that I retained most of what I learned. I took a little thinking before I could get back to certain things, and a redid a couple refresher lessons in the course with a few things I was not remembering well enough. But at least 90% stuck and after a month of playing and building callouses back on my fingers and getting hand and arm strength, I finally felt as tho I had never stopped.
I hope your venture back allows you to get back very close to you were when you left off and you can quickly get back to form. I know you can do it, I did it and I am nothing special.