MRI and CT scans should always be done with contrast if a patient's kidneys can tolerate the contrasts (gadolinium contrast for MRI scans). contrast helps the radiologist see blood vessels better anywhere in the body. the increased styloid process which causes eagles syndrome could be pressing on the vagus nerve to cause nausea, sick feeling, headaches, throat pain, sore throat. if the pain is long standing chronic pain, this can also cause fatigue as well. if the pain is bad at night, you might not be sleeping well and this can cause day time fatigue as well. you definitely need a CT scan of the bones of the neck to best see the styloid process and how large it is. an MRI scan of the brain with contrast may or may not help. if the styloid process is truly enlarging and your symptoms are worsening, you might need a surgery for a partial styloidectomy to cut down that styloid bone to decrease how much pressure that bone can cause onto your nerves and throat to help decrease the pain and hopefully eventually help with the fatigue. does this help?
have you consulted with a spine surgeon about cutting down on the styloid process with a partial styloidetomy surgery?