AM I WRONG TO FEEL AGITATED, DOWN, UNMOTIVATED AND SNAPPY AT THE DROP OF A HAT!

At times, I have been overwhelming feeling come over me, I can't quite identify it, but it stops me from being motivated and how I present to other people.  I can only describe it like a dark abyss and feelings of being lost.  I do eventually come back, but I don't like this feeling and it happens quite a lot.  I guess it is part and parcel of being autistic.  I was wondering, how do others manage this, or do you in fact feel this way.  I do try and snap out of it, but it is not that easy.

I am not sure whether it is to much information, or activitiy in my head, but I have been thinking of meditation.