What Do Lesions In The Brain And Benign Tumor In The Liver Indicate?

Hello, my name is Tori. About a year ago I started to have vision changes, constant headaches, blurred vision, double vision, loss of perception, no convergence, tingling in hands, feet, legs, and arms, drooping eyelid(s), and more. Over the past six weeks I have become very weak, my legs will give out, I m exhausted, I have difficulty breathing, and swallowing, I had an MRI that found leasions on my brain and benign tumors on my liver. My doctors have tested me for myasthenia Gravis and have done lots of testing, no one can figure out what is wrong. Do you have any other ideas?