Thats like saying you shouldn't quit smoking unless you have cancer. Its doing invisible damage the whole time.
If proper protocol is used, you will suffer much less Mercury exposure that you would by leaving them in. Your mouth is dammed up so you can't swallow it, a vacuum is used for the vapor and the material, and you are being fed oxygen. It's a one time exposure that is kept to a minimum and then its done with. Keeping them in you expose yourself hundreds of times a day.

And you are experiencing mercury symptoms. Depression is one of the foremost symptoms. Any chemical/hormonal imbalance can be caused by Mercury. Weight problems (apart from poor diet/eating habits) can be mercury. Insomnia, fatigue, acne, mood swings, the list goes on forever. Look at the years since this substance has been used is people's mouth. Depression is at an all time high, Fibromyalgia, Chronic Fatigue, Bipolar, MS, Autism, all of it at an all time high. You didn't see a fraction of this 50 years ago. Yes they have all existed for a long time, but so has mercury poisoning through other sources than your teeth.

You made the right decision in removing them, you have to make the right decisions with detoxing as well, or you can exacerbate your symptoms. Don't be afraid to try Alpha Lipoic Acid. I as well as Russ on this forum seem to get a bit euphoric from it, where as DMSA makes me feel down. I combine the two to be more effective because its tolerable, but you could do the ALA by itself, just start very small. As for your reaction to it, each round I do, days 1 and 2 are spacy, irritable, depressed, scared and anxious, around day 2.5 -3.5 I start to feel like I'm on top of the world. This continues for 3-5 days afterwards. This happens each round, w/out fail. You may need to just push through it (use your judgment) I would also incorporate Algin, it seems to make a big difference with me and the symptom control.

I disagree with the mentality "if its not causing you problems, don't mess with it" For it most likely is causing you problems you just don't know about them yet. However if you are showing symptoms that are mercury toxicity possiblities, get it at the source, or atleast eliminate that possibility and go from there.