Worried i have tonsil cancer

Hi in March, i became ill with tonsillitis and one of my tonsils became severely swollen and had not gone down since. I became worried about this, i called doctor and they said not to stress and just take pictures to see if it grows. It had swollen up more but looking at the photos it keeps going through periods of swelling then returning to a smaller size. I also get tonsil stones so i'm hoping i just have tonsil stone stuck causing the inflammation. I have recently been worrying a lot more about it and i've now started to feel pain in my neck but i don't know if it is due to my anxiety. I'm 20 years old and don't regularly smoke or drink and i would consider myself healthy.