Do I have tonsillitis or quincy or do I need my tonsils removed?

Wednesday night I was fine and through the day but when I woke up on thursday morning, my left tonsil was red and had two small white dots on them. As the day got on I didn't eat much until I decided I would have to have something just to keep energy but I was sick for the rest of the day and night (3pm-10pm) and most of the time it was just water which I was drinking. Then on friday after college I went to a pharmacy to get throat spray as my throat was hurting and they give me a spray called "Difflam" and said to use it over the weekend to see if it helps. Its saturday night now and my left tonsil is full of white spots and the spray stings when I use it. I've eaten ice and ice-cream - I've evan gargled salt water and mouth wash but nothing seems to help and it really hurts when I swollow and sometimes theres a horrible taste when I do swollow - please help!