my 13 year old boy

this is acually for my son he is 13 yrs old and has had headaches we took him to the eye speicialist and she ran all the test catscan,mri of the eyes, mri of the brain she didnt see anything imeddiate so she sent us to a peditritian that diagnost with palidemeia pressure of the brain he had a spinal tap that day and was sent home on medication he continued the medication for one month and it looked like to the peditrician it was getting better. Recently my son complained of blurred vision in his left eye so we took him back to the eye specialist and he had inflamation (inflammation) of the optic nerve and a small tear on his inner eye so he must have laser surgury to rapair the eye and she tells us that its possible that he may have a brain diesease can anyone help me out im scared and all the dieses ive found have other severe warnings?