I've learned that friends are tricky. They come and go, some after supporting you for years and suddenly deciding they no longer want to be in your life. Those losses are hard, but it's ok. Because even if you feel alone, there are always people who care.
I've found that some of the best people to lean on can be those you've met through social media. Yes, Facebook can be a curse with all of those who pretend to have perfect lives, but it can also be a place to find groups where you are safe. Groups of people who understand. Some of those people may even become friends. It's interesting to me that some of the people I trust the most are those who it took years to meet and who I haven't seen since (but hope to again!) Some I haven't met and probably never will. But they are my people and I love them dearly.
That said, there is no replacement for people who can drag you out of the house when you have no desire to go. Who can help pull you out of that cave of depression. For me, it's my husband. There have been friends here and there, but no one will ever compare to him. He senses when something is off, sometimes before I do. It's truly amazing.
I say all that to say this - find your people. Whether it be online, through your church, in your spouse. Find people who get it and won't run away when so many do. It's just as important as medicine, because that alone won't keep you truly happy. And if you don't believe those people exist, I promise they do. Don't be afraid to find them.