I have had a filling done yesterday and the dentist have me an injection to stop it from hurting. After a couple hours my whole lower lip went exactly like yours. I then went to the hospital and they said it's an allergic reaction. The doctor has currently gave me piriton for me to receive daily. I see no current effects, but the lip has stopped growing. I advice you to go to your doctor like I did and he can give you some medicine for an allergic reaction. I hope I have helped.