I asked my Aspie husband who has been IPed twice for depression/anxiety/suicide attempt about how he survived. He has MASSIVE sensory overload issues, and is a control freak.
1) Everyone hates groups. You are not alone. My husband would talk up a storm in group therapy because what Aspie doesn't like to monlog at a captive audience? They caught on pretty quick that he would dodge talking about himself. Lol.. Best way to survive group is be the first to open your mouth. You will not talk longer than 10 mins, and you have the other 80 to sleep or zone out.
2. Food. Find one thing you like and keep reordering it. He had pancakes for breakfast, PBJ sandwiches for lunch, and dinner was a chicken and rice dish. He ate that for two weeks, mixing in chocolate milk or apples sometimes. My DH said he could always get a chicken sandwich and order a little salad. Take the lettuce and veggies and put those into the salad. He loved not having to think for meals, and eating his same things with no one questioning him. There was a elderly man who didn't talk at all, and he would sit by him. Eat what you want with no need to talk? Heaven!
Because the days are so structured, my husband enjoyed that too. The Aspie part of him loved not having to think and motivate.
The lights/smells/sounds. DH has migraines and that was rough. The doctors did start him on Depakote which is used as a mood stabilizer and for migraines. He was allowed to leave a group if it got overwhelming, because he always made an honest attempt to show up and participate.
He blamed most of his I hate the world/isolating behavior to the depression/anxiety. The ASD part loved all the no control/structure. His depression part hated it.
I was there when my husband tried to kill himself. I don't know why your family can't/won't visit. The people around you maybe be really, really angry. I visited my husband whenever I could because I knew it would speed up him feeling better. I was not always thrilled about going.
Hang in there.
PS: ask for your Ativan, sleeping pill, and whatever else makes you groggy BEFORE bed. My husband is an insanely light sleeper. The staff switched up the medication times to at bedtime, and that would knock him out.