night time epilepsey

i have a 12 yr old son that has been taking homeopathic medication for night terrors. he wakes screaming, sweating heart racing pupils fixed yet recalls nothing afterwards. i caught him once just about to jump out of his bedroom window, the medication he has been taking have made things slightly better but only just. last night i watched him sleeping and the left side of his body was jerking like a spasm movement. as a baby he suffered with convulsions and was under a neurologist as his body jerked during his sleep. the neurologist dicharged him and said they did not know the cause can any one tell me if they believe that my son is suffering with night time epilepsey and if so how can i get him diagnosed.