Hi dear thanks for choosing HCM for you query, from the symptom you described , it seems you have infection in your ear, which has caused the enlargement of lymph
node and lymph node are tender because of infection,yes the pain caused by ear infection
can radiate to your tooth also ,it can also radiate to your neck ,nose and throat ,as all these are connected internally and share common nerve supply,you could have taken antibiotic for your ear infection and it would have settled you problem,breast feeding is no contra indication to antibiotic therapy,there are medicine which are not secreted in breast milk and there are medicine which even if secreted into the breast milk are safe for new born,take a course of antibipotic like augmentin
,( amoxcillin and clavendic acid) it is good antibiotic and safe for your newborn as well .you can also take mild analgesic
,small dose of which will not cause harm to your neonate.