No they don't get you high, but they do stabilize your moods, and you are able to get through the day feeling sane and normal. I took the anti-depressant Zoloft after both of my pregnancies, as I suffered from postpartum depression. They take about 1-2 weeks to kick in, and it really works. I was much happier while I was on them. There are sexual side effects with Zoloft though, and you feel really numb down there. But, it suited me just fine because believe me, sex was the last thing on my mind following the birth of my kids. I was on it for probably 1-2 months and then I slowly weaned myself off of it.
Limpbizkit did make a good point though - smoking weed makes you happy as well. At that point in time, I wasn't able to smoke because I was breastfeeding, but as soon as that was over, I smoked a bowl and boy did I feel happy
There are many types of antidepressants, and some don't have sexual side effects. I think Wellbutrin (sp?) may be one of them. Go see a doc and have him give you the options.
Good luck.