I am so sorry to hear that your son is not doing well. It can be especially alarming and concerning when young children are ill, and it is very easy to feel sympathy and compassion for them. In this specific case, it sounds like you are taking appropriate steps to determine what the cause of the bump is. There could be many potential causes, but it sounds like you have thus far not had success. It may be time to seek the advice of a specialist, and in this case I would recommend an ear-nose and throat surgeon
, or otolaryngologist
. He or she will best know what recommendations to make and if there are further tests that need to be ordered. While it is reassuring that most of the tests have come back fine thus far, it is clearly not a normal thing for lymph nodes to persist for so long. In some cases, a biopsy of the bump may be necessary to determine the next step to be able to get him feeling better, especially since he is now starting to have some additional symptoms as well. Please speak with your doctor
, and if you have further questions, please consider getting a second opinion.