The most acute case of odynophagia I ever had was when I had chicken pox when I was six. The first couple of days were itchy, but bearable. Then, I got a huge pock right in the back of my throat, right behind my uvula. Once that thing appeared, swallowing was absolute agony, and it was all my mom could do to keep me from getting completely dehydrated. She would fire some Chloraseptic at it to numb it and then while it was numbed, I would eat soup or mashed potatoes and drink water and juice. As soon as the numbing wore off, I was in misery again.
I have nothing but the deepest sympathy for those who experience this condition on a long-term basis.