I can sense your frustration with your.. rightfully so! The meds DO take a full 4 to 6 weeks to kick in My H had to go on double doses of two different anti-Ds to get the full effect, though I wouldnt suggest it. That came with some side effects.
Your post made me think in terms of time. H was getting depressed/depressed for a year before things got very bad. It's been 9 months since that and his mood is better, but the climb back up is hard and Surprise! the anti-Ds don't fix the problems that got him in that place to begin with. I want to mention also that once he was back to "normal" feeling wise (meaning he could feel his emotions again and start dealing with all he'd stuffed), he went through two full months of extreme guilt and mood swings, just remembering how bad he treated us. He was emotional, weepy, clingy, angry - you name it and we saw it. He had the first all out tantrum of his life on his parents after the meds kicked in. It took him 45 minutes to express some things he'd bottled up for years. So be prepared.. it could get interesting! Not to say my H's reaction is typical - I don't know if it is or not, but wanted to give you a heads up.