Minimal dosage symptoms and conditions

I'm a 35 yr male and have been dealing with depression/anxiety for years due to current & past issues in my life. This post IS dealing with singulair side effects but want to give some history as to why I think it's singular and not something else. For the past 2 or so years I've been using xanax which has worked fairly well in controlling my anxiety, but my doctor preferred I stop taking it because of it's potential for abuse. I've been on SSRI's before and I hated them, so I did some research and decided to try wellbutrin which works differently from the SSRI's. I was still using xanax while ramping up on wellbutrin the end of February. To my relief, the wellbutrin started working wonderfully - felt like I could cope with life, increased energy, better mood, with no negative side effects (actually some positive ones) - the only problem I was having is I traveled during this time frame and developed a bad case of sinus rhinitis due to the climate changes. I've had chronic sinus problems my whole life so it's no surprise. I tried most otc meds and nothing was helping. In the meantime I was feeling so much better (other than the rhinitis) that I decided to start tapering myself off the xanax. When I got to the point where I'd stop taking the minimal dosage I would start getting physical withdrawal symptoms (headaches, dizziness, etc) which is fairly common after taking for a prolonged period of time. The side effects were strictly physical - no excessive anxiety or psychological craving My sinuses were still really bothering me so I had two reasons to visit the doctor - try to get something to relieve my sinuses and to get a short supply of a benzo with a longer half-life to ease the withdrawal from xanax. The doctor gave me a prescription for a month of diazepam and 9 weeks of singulair samples. That was 3 weeks ago. I immediately begin using the singulair, but still had some xanax left so I decided to continue on a minimal dosage and use it up before I went to fill my rx, which I just started several days ago. Coinciding with when I started taking the singulair, all the positive benefits I was feeling from the wellbutrin just suddenly stopped. My depression and anxiety came back worse than they were before - another persons post describes the change in me: feel very anxious, fearful, reclusive, depressed, that everything is going to go wrong, or is always wrong. I'll have extreme anxiety about small everyday things. I’m unable to concentrate. I've also become more irritable, argumentative, and aggressive. I have difficulty falling and staying asleep. I also experienced a very noticeable decrease in sexual energy after a very noticeable increase which is a side effect of wellbutrin. I can even understand the rationale for suicide just to be free of this emotional nightmare - not that I would do it - but can understand it. I couldn't figure out why I went from finally feeling good about life to suddenly feeling worse than ever before. I guess I didn't realize it right away because my sinuses were much better, but I know these symptoms began occurring very shortly after I started to take the singulair. I was trying to figure out what was going wrong with me and yesterday I did a web search on 'singulair side effects' (since it’s the only variable I could think of that changed within that time period) and came across this site and several similar ones. It blew my mind how many people were talking about the exact things I was feeling. Yesterday was my last dose. Does anybody know how long it takes for this crap to work its way out of your system after 3 weeks of use???