It really just depends on your individual brain chemistry. Anti-depressants work for some and fail for others; the biggest reason they fail is the brand. If you do decide to start an anti-depressant, you might have to try a few different meds before finding the one that works best for you. Luckily, there's a lot of options out there, but for example, Zoloft works for me and Lexapro works for my mom but did absolutely nothing for me. (This might be because I have OCD and not depression, though...) Unless you're strictly against taking medications of any kind, it might not hurt to talk to your doctor about your feelings. Who knows? Maybe your problem can be solved just with therapy and you won't even need to take meds! If your doctor does think you need an anti-depressant, it might be wise to follow his/her advice (unless of course you're against medicating yourself for whatever reason). I realize that many PCP's nowadays are overprescribing anti-depressants, but if your doctor would recommend one, you probably need one as you've already suspected that you might have depression. For both my mom and I, the SSRI's that we take not only help for our mental illnesses but also for our irritability. Both of us can tolerate people more easily with them and we aren't constantly at everybody's throat- an anti-depressant might help immensely with the situation with your stepdaughter. At any rate, do some research on the Internet about depression and PTSD, and if you're still leaning in that direction, I'd advise talking to someone, even if it's just a therapist. I'm also in therapy (Cognitive Behaviorial Therapy for my OCD) in addition to the Zoloft, and it does seem to help me. More often, people need either straight therapy or a combination of meds and therapy. If you do decide to take an anti-depressant, don't feel ashamed. It's not a weakness! I went through the same thing when my doctor prescribed me Zoloft- stupid OCD made me feel like a drug addict and I was deathly afraid of becoming addicted. If this is your fear as well, SSRI's such as Zoloft, Paxil, and Prozac are the way to go because they aren't habit forming. I wish you the best of luck, and I sincerely hope that you're able to feel better soon and overcome your depression, whether it be with or without a pill. God bless and write back if you have any more questions!