First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
AcuteAcute bilateral obstructive uropathy
Acute bronchitis
Acute cerebellar ataxia
Acute cholecystitis (gallstones)
Acute cytomegalovirus (cmv) infection
Acute gouty arthritis
Acute hiv infection
Acute kidney failure
Acute lymphocytic leukemia (all)
Acute lymphocytic leukemia - photomicrograph
Acute pancreatitis Disseminated Encephalomyelitis (ADEM) is an inflammatory disease that affects the brain, specifically the myelin sheaths that surround the nerve axons. With loss of myelin "insulation" signals are slow and get crossed, causing loss of function (motor, sensory, vision etc), seizures, headaches and/or loss of cognitive function. Steroids help by reducing the immune attack on myelin and reducing the inflammation of the already attacked myelin. The actual cause of ADEM is usually not known, but is thought to be precipitated by a response of your immune system (to a virus, bacteria, etc) that happens to attack myelin as well (called molecular mimicry). Since we often do not know what is causing the ADEM, we are never sure when to taper the steroids. Most cases of ADEM are "mono-phasic" or only involve one attack. Rarely, ADEM can recurr or what was thought to be ADEM may turn out to be multiple sclerosis. Steroids also have negative effects as well including weight gain, thinning of the skin and weakening the immune system. That being said, Many patients suffereing from ADEM require an extensive steroid taper, due to recurrent symptoms. I would suggest that you get a repeat MRI of the brain and C-spine with GAD contrast to make sure you do not have any new lesions (New lesions might suggest multiple sclerosis or a repeat attack of ADEM). If no new lesions, then finding the lowest dose of steroids that takes away your symptoms should be achieved and then you can restart the tapering process. Some of the damage to the myelin can be irreversible and cause chronic problems of numbness, pain, etc. For this I would recommend starting a medication for neuropathic pain such as elavil, neurontin, topamax etc.
I hope this has been helpful.