In my office we would perform all of the procedures at the same time. There is no reason to put you through multiple appointments when one visit is suffice. We would replace the fillings on the molars and following that extract the wisdom tooth. Hope this helps.
It can take longer than 1 week for the stitches to dissolve. Don't worry about that. If you find it uncomfortable, then I would recommend that you call the surgeon that removed your teeth and have him look at the area and remove the suture if necessary.
Your symptoms are classic for Acute Alveolar Osteitis or "Dry Socket". Of course without examining you this is only a VERY educated guess. "Dry Socket" is when you dislodge all or some of the blood clot in an extraction site or the clot breaks down on its own before it matures. This...