When I had it done it was way before all the information was on the net about mercury. In the short term it made me worse as I started passing all sorts of parasites and my intestinal flora changed, probably for the better, but it was a detox that I couldn't stop.
In the long run I'm glad that I had them removed but it feels like it could be a lifelong process to clean out my gut from all the mercury, and I only had a few fillings.
If you don't think you can handle getting worse for a short period then I would wait to do it.