Antifreeze will be fine. It's not like water. The antifreeze has replaced all the water and it's in a sealed system. There's nothing to worry over.
If you poured the antifreeze on the ground, yea, things would happen to it. But being in your water lines is no different that being stored in the original jug.
Assuming your battery has long been removed, you won't have anything to worry over.
Now, when you do get it rolling again (literally), you'll probably need new tires because of dry rot. The bearings may need to be repacked, and of course the battery will need to be charged and re-installed. You'll want to give it a good inspection, especially the roof and all the seams, check out all the systems again, make sure mice did not invade or wasps did not nest in your vent pipes on the roof or the water heater vent. But those are things that you can't prevent, and will need to be inspected when you are ready to roll again. Until then, if it sat for the first year, it will be fine the second year.
Hope you get 100% well REAL soon!