Not a mental health care professional here, but if you ever want to talk, hit me up in PMs. I dealt with depression for around 16 years on and off, and while my circumstances weren't the same as yours, I do know what it feels like when life just doesn't feel worth living.
edit: If you're a gun owner, I would suggest removing the guns from your household and having a trusted person, that knows what you're going through, hold onto them for you.
edit: If you're a gun owner, I would suggest removing the guns from your household and having a trusted person, that knows what you're going through, hold onto them for you.