Medical Appointments....venting...

I absolutely hate going to Dr and Dentist appts. I have been having trouble with my thyroid and my blood pressure. When I try the meds I have reactions and I get so tired of the medical professionals questioning me to see if it is in my head??? I will tell you after all the years of being ill I know when I am having a panic or nervous reaction to something and I know when a medicine is causing me to have a reaction. After passing the age of 50 and still hearing this ......I am just about to the point when it starts to just get up and walk out. I am in a rut and seem to do better if I just stay on my regular meds and try not to add anything to the mix. I am just venting here..... Why can't the Dr's just listen and try to believe what you tell them?