It sounds rough. I'm not sure what to say to you that might help. I'm pretty sure that hypochondria is a real disorder. It's a type of anxiety disorder I'd guess. The Mayo Clinic among other institutions recognizes it as a real disorder. Can your GP refer you to therapy for anxiety? If this is your first time seeing this doc chances aren't good that you will be prescribed an anxiety med but maybe he/she has some help to offer. I have a relative who gets blood clots often. I've never heard her mention itching as a sign and trust me I've heard every other sign/symptom she has She's the type of person who gets a headache and worries she has a brain tumor
Try not to read any medical books or watch any tv programs about doctors.
Maybe someone else with some experience in this will chime in.
Let us know how it goes next week.