About 30 hours ago while eating a banana, the left side of my jaw line swelled and throbs.  I had this happen for the first time a couple of years ago, and went to a walk in clinic as I was in Arizona at the time.  The Dr. gave me an  antibiotic, rinse with salt water, and suck on lemon drops.  I am treating myself this time by taking two 800mg two times yesterday and three times today Amoxacillin.  Rincing with salt water, and sucking on lemon drops which make it swell and throb worse as it does when I try to eat anything.   Also very painful to touch.  Any advice?
HI. This is a classical swelling of the sub-mandibular salivary gland, producing the thick saliva necessary for chewing process. Most probably there is an obstruction in the duct which carries saliva into the mouth. I would advise you to continue the medicines and Visit an ENT Surgeon who would ask you to go for some tests, mainly the ultrasonography / CT Scan to confirm the diagnosis as also would palpate the gland and mouth. The findings would guide for the further treatment.