Welcome to HCM
After going through your history, you was infected tooth for more than 2 months,why usually antibiotics along with analgesics and antinflamatory drugs give temporarory relief and mostly neglected by the patients.
It is good the carious tooth is extracted.
Your problem is related to Fluid and electrolytes you loose due to diarrhoea
and if any analgesic you are taking may cause gastritis
which is drug induced.
Keep yourself rehydrated by plenty of fluids like Coconut water,buttermilk,if diarrhoea is troublesome get in touch with Doctor antibiotic may be changed.
Even after course of medicines you may require a Pre and probiotics suppliment.
Also check Low hemoglobin
if it is there may be causing your symptoms so consult Physician if required .
You will be alright in few days time.
Take care of your health