What drug...? (depressed, Zoloft, Ativan, sleep)

[tvdxer]

I have been very depressed and somewhat anxious for a little over a year. My father died in 2006; I was diagnosed with an (ultimately) lethal brain tumor in 2009, followed up by surgery and rehabilitation; I had several risky encounters with my brother soon after my tumor was operated on; my house had a fire, forcing us to leave it for a month and then return when construction crews had a month to go, because my mother spent all of the insurance company's "living expense" money on store bills; our store eventually failed, putting me out of a job without unemployment insurance (although I lived with my mother); I lost probably 75% of my possessions to theft. All of these things I had to bear without any support network, except for some distant friends. If that isn't much, I don't know what is (of course, I could have it worse - I recognize that).

I was put on Zoloft for a completely different reason in 2003; "scrupulosity" or religious OCD. This eventually cleared up my problem. Meanwhile, my doctor kept me medicated, and switched me to Prozac. I forgot to take my Prozac with me on my trip to Morocco and Spain in 2008; within those 26 days, I lost an estimated 35 pounds. I felt that my abstention from Prozac was one of the causes, so I only took it to fend off withdrawals. Well, I'm still on Prozac, even though I have not taken it in about a month. I think I need something else. And what would that be?

When I was suffering from insomnia possibly induced by chemotherapy, my brain tumor center put me on Ambien. It turned out to work miracles: not only did it put me to sleep, but it made me incredibly happy! A drug with the same effects as Ambien, except somnolence (sleepiness) and lack of coordination. In other words, a psychoactive that makes you feel happy and optimistic. I've always thought that optimism was a complex emotion and not tied with any specific chemical targeted by a drug, but apparently, when I take Ambien, my experience is:

1) It lifts my spirits
2) I take greater interest in things
3) I actually feel a sense of hope for the future, which is very important for me.
4) I find it more difficult to get sexually aroused

Therefore, I'd like to hear if there is some drug out there like Ambien, except that it is not used as a sleep aid but as an anti-depressant. I've taken Ativan before, but that only calms me down. If you know of any, please suggest them and I will see if I can get a prescription.