you can gargle with warm salted water to give relief, then wait, gargle again then wait

If it just appeared and there are no obvious symptoms of illness (like the flu), it could be herpes or HPV. Go see your doctor.

I had white bumps all riddle the back of my throat and tongue, where what caused it was eating too much peanuts. I am betting that it is just a sign that they are allergic to something but not severely allergic to it.

It could be an ulcer