I've been having pretty much constant headaches everyday for almost four month an long with muscle twitching ear ringing and some other symptoms. Doctors all told me it was sinusitis and stress. I didn't believe them. Was referred for a brain mri for my "peace of mind" anyway mri came back clear except for slightly infected sinuses. However this was almost 3 weeks ago I still have the headaches but the sinus infection seems as though it's cleared up. My question is because I had MRI without contrast what are the chances the scan missed a tumour ? :( really worried