There is no evidence that there should be any concern that you have a brain tumour. I’m not sure how much information that you gave to the other web site, but a brain tumour would not cause symptoms that have been present since age 13, getting worse recently, and also have a completely normal neurologic examination.
Even if we ignore the presence of symptoms since age 13, there would not be a reason for concern. It is true that early in the course of the growth of a brain tumour, there may be no symptoms or changes on neurologic examination. But as the tumour grows and progresses to the point that it is causing the symptoms that you describe, there would be evidence of neurologic dysfunction on neurologic examination. Since you have a normal neurologic examination, there is no reason for concern that you have a brain tumour.
As we discussed previously, I cannot examine you, so this statement is obviously dependent upon the examination that you say was done by your doctor, and you say that you trust your doctor’s examination. However, what we discussed previously would also apply to this situation – if you do not trust the examination of this doctor, it would be reasonable to consider seeking a second opinion. But if you trust the examination by this doctor, then there is no reason to seek a second opinion and no reason for concern that a brain tumour is causing your symptoms.
If you need any clarification of the answer to this question, please let me know.