In my opinion, 3000 mg of ampicillin/day is way too much. The usual dosage for dental infections is 500mg (1 tablet) 3x/day, and a 10 day regimen is fine. Over dosing will have other undesirable affects on your gastrointestional tract and other potential complications.
It usually takes 3-4 days before the antibiotics start to have some effect, but discomfort may not be fully relieved pending on how bad the infection is. November is a very, VERY long time to wait having an infected tooth around and not being properly treated. You'll most likely end up with a lot of bone-loss around the tooth, which could cause the tooth to become very loose, and make it unrestorable. When you lose too much bone around a tooth due to infection, the bone loss can be permanent
and greatly jeopardize the prognosis of this tooth. It can get to a point where root canal
treatment is not even recommended because the tooth will need to be extracted due to insufficient supporting bone.
If allowed to continue without proper treatment, the bone loss will spread and affect the adjacent teeth, jeopardizing the health of those teeth as well.
I understand finances may be tough, and sometimes, we need to make sacrifices. But I would highly encourage that you go and see your dentist, get the tooth examined and treated sooner rather than later.
Depending on the severity of the infection, you may need multiple rounds of antibiotics before you can suppress the infection enough to reduce the pain. However, prolonged antibiotic treatment can potentially lead to antibiotic-resistant strains, making the infection immune to the antibiotics.
JulXXXXX XXXXX, DDS