The doctor seems to think he does have tonsillitis and it seems he's not doing anything to help him get better. Call him on it. Ask him point blank: "What are you doing to do?" If he wants to "wait and see", with me, when it comes to my children, that won't cut it for me as I want answers and immeditate action. All doctors take the hypocratic oath that begins with "First do no harm" and if he's not helping your son, then it would seem he's doing harm.
Some suggestions: get a second opinion, or take him to your local ER and see what they have to say. If surgury is an option for you (some parents don't want to do that to their chidlren) then get him what he needsl. I've never dealt with tonsillitis myself, but I know what it's like to have a sick child and it is just heart wrenching.
Get your son a second opinion and help him get better. Good luck to you...