>>3 your pickiness (and your nostalgia) are just symptoms of the general withdrawal you are experiencing.
There is nothing perfect in this world. And all the positive experiences you have experienced until now had their imperfections and blemishes. Still you enjoyed them, because simply the good stuff was touching you more than the bad stuff. Right now there's a lot of negativity in you, and you are more sensitive to the bad stuff than to the good stuff.
You are simply running away from reality into a dream world. You need to realize that reality, even with all its warts is more beautiful than your dreamland. Beauty is in the eye of the beholder. You cannot appreciate beauty with a rotten spirit. What you are fighting is not the outside reality, but your internal angst. When you start to perceive beauty in the outside world, you will start to heal. Maybe you should exercise it: try to find something really beautiful in the outside world. Check it in detail, see its warts and imperfections, and how they don't prevent you from loving it. Plants and nature are a good starting point. Preferably look for things outside of your home, so that you don't isolate yourself.