It all depends on what your dentist will see. You might need an X-ray to check on that tooth, and the pain might be from that tooth or the neighboring ones or the opposing one, visit your dentist, and sure enough he will let you know the source of pain and change the filling if it needs so.
Plaque builds up if the teeth are not brushed well enough or the type of food consumed allows the build up. Yes, you may need to do hygiene more than twice a year, depends on what your dentist sees in your teeth. I recommend eating lots of greens in your salad and please see your dentist.
I recommend you call your dentist’s office and go there for an emergency treatment. I’m sure they can fit you in the schedule, rather than taking more medication. I want you to know what your pain is from; treat the cause, and you will feel better.
I hope that helps.