about a year ago i was in an accident and received a head trauma. since then i have had little or no short term memory and a quite bad long term memory. i remember very little from before the accident apart from the odd thing. over the past few months i have had a reoccurring nightmare of something that happened in my past. it is not a very nice memory and i would rather it wasn't there. i was wondering if there is any way to stop these nightmares and or get rid of the memory?