Glad to see a post from you but sorry to see why. I feel for you man. I got mono before , was misdiagnosed multiple times and spent over a week in the hospital so I feel for you man.
I know it's hard to accept but you won't have to start completely over from bodybuilding . You'll probably find that results might actually come quicker when and if u start up again. Take the time to rest for now...you'll be happy to did.
As far as being discouraged...I ve been around music my entire life and when I starting playing footbag Left my personal music to the side even though I was still making a living playing music. Recently I have not played as much footbag but have enjoyed music for the first time in years and have decided to push my skills more than ever, while still enjoying the occasional footbag session.
Cycles of life are sometimes mysterious ad don't reveal right away what will be next . It will present itself to you . Maybe this is a time to focus on relationships, on finance, on family, on travel, on work, on reading, on footbag, on anything that u choose. Take a short break from being stressed over this and set a goal just as u did with bodybuilding ...the goal could be short term or long term , there could be mutiple goals ..and just work towards them .
Looking forward to see what u come up with and if you decide to get back into footbag please film
Peace