[Alessio]

There actually is something that can be done about excessive sweating. Hyperhidrosis is actually quite common and they can actually remove a portion of the sweat glands or disable them trough medication.

Also, the actual cause isn't always relevant if you want to treated for an ailment.

GP's are known to just wave off complaints and give the same advice that your own grandma would give. But if it really bothers you then you should tell your GP that you want something done about it and that he should look into it. That you do not just want advice, but also a cure. You could ask him to refer you to a specialist aswell, as GP's are often just generalists, so he could lack the knowledge on the subject.