depending on what type of messages like things that are very worrying and contain things like your adress and hassment then i would say take it to the police but if they are just being perves and being annoying blocksss themmmm
you might want to see a specialist for something that you know is specifically is wrong with your body such as your having sight problems or hearing issues. You would see a primary care if you are just feeling sick or are hurting and you need a diagnosis to find out