Hi, I'm 44 Years Old. I'm In Good Health And

Hi, I'm 44 years old. I'm in good health and exercise regularly. Recently I've been having moderate headaches and facial pressure. I thought it was sinus related but had a CT scan of sinuses and it did not show any inflammation or infection. PCP said if I continue to have headaches see a neurologist. Do you have any thoughts on other symptoms I should look out for that would relate to a serious condition?