I've been through all of that and yet I'm still struggling with finding something really helpful to say. I wish I could think of something that was said to me that helped but I can't remember anything anyone ever said that was very useful. What RuralOwl said was nice. Try to keep in mind that you are worth being helped and that there are people who want to help. Don't look at the big picture... you will only see it through the distorted lens of depression. Keep things down to a more manageable size. Write down some small challenges and try to take them one by one.
One thing I can almost promise you is detrimental... staying inside. Try to get out once a day even if it's just for a short walk around the block.