Sorry to hear of your health issues and depression Kenneth as I have some too and know where you're coming from. Just "hang in there" as sometimes there's not much more we can do.
I got rid of my air brushes and compressor awhile ago as it is a LOT easier for me to just "shake and spray" and I've got some great finishes using that method instead. It works for me.
I myself would never store plastic model kits in the garage because of the very high and low temps in my garage and I would not be okay with any kind of warping that may occur. I think that it's a gamble that not a good bet.