No, unless there's a permanent brain damage, which wasn't true in your case loss of memory from concussion lasts anywhere from a few minutes to a few hours, a few days, never longer than a week or so.
Ne, osim ako nemaš trajno oštečenje mozga,što nije tvoj slućaj gubitak memorije uzrokovane udarcem traje odprilike negdje oko par minuta do nekoliko sati, dana, nikada dulje od tjedan dana ili sl.