Very sorry to hear your are suffering.
In terms of depression, caffeine very early in the morning only has been the most consistent things that has helped me, as it makes the brain more responsive to circulating dopamine. Maybe give it a try… If you’re suffering is extremely severe, maybe consider ketamine, but do your research.
In terms of sleep you need to get the basics in order:
-Room should be 65-68 degrees (get a thermometer to make sure)
-Try to do something to ease your mind before bed such as meditation or a meditation tape while you’re in bed
In terms of sleep supplements, maybe try
-magnesium l-threonate
-L–theanine
-a glass of tart cherry juice
-Yogi soothing caramel bedtime tea
I also suggest listening to the Huberman Lab podcasts on YouTube that discuss ketamine, caffeine, and sleep.
You’re not alone brother, hang in there.