My right tonsil is swollen and it hurts to drink cold stuff or swallow. my throat is also sore. what could be wrong?

Possible viral or: bacterial infection. For significantly sore throat w swollen tonsils / lymph nodes – see physician & get a strep throat test & culture. Antibiotics are imperative for Strep Throat. Try saltwater gargles. Mix tsp of salt in 8 oz of warm water – gargle several times/day. You can gargle w Aloe Vera juice a couple of times per day. A mix of chamomile tea w honey & a small amt of lemon juice helps.