Bump on muscle after filling

[JessicaC]

Four days ago I had two fillings on my upper left back molars. The first day after was fine, but each day the pain gets worse. Now, I can barely open my mouth and I have pretty severe pain in my lower muscle (i.e., mylophoid or diagastic muscle, can't determine which) and there is also a bump in the shape of a cylinder about 1 1/2 inches long. My dentist office doesn't open until next Monday so just wondering if this is a concern.