Although I cannot solve your problem (it really takes time for pain to vanish) I can give you some tips which my sister used after hers tonsillectomy (she had it in 2009).
First of all, you need to drink a lot of water. Not juices, milk or soda, just water, and don't use a straw. You can try adding jelly, pudding and yogurt in your eating schedule. Eat and drink as slow as you can and try to swallow very carefully.
Second, prepare yourself on more pain. She was in pain for about a month after the surgery. I know it sounds scary, but you must accept it. Go with the flow, try to think on something different apart of pain, keep your mind busy.
And, just to let you know. My sister had some blood clots which she was coughing out. Doctor said to her that's something normal for adult tonsillectomy so, if you experience anything similar, don't panic. But, visit a doctor, just to be sure.
I hope that some of this can help you. If you have any more questions, feel free to post it. Cheers!