A year ago I also had the same sad day as I watched our Cougar trailer leave our storage spot for the last time. It was a double whammy as a few days later I watched my beloved F250 leave my driveway with someone else behind the wheel. My loss was also due to health issues. The good news is that now, a year later we are actively in the hunt for a nice Class C that will be easier to care for than our last setup. My health has improved enough that I feel I can do what is needed to setup and maintain the new rig. I know the feeling you are having right now and I also know it is not a good one.
Cherish those times you enjoyed in your rig over the years and take solace in the knowledge that you did the right thing.