I was EXACTLY the same in my 3rd trimester! I would just be so moody and had huge arguements with OH over nothing really! One time I threw my GHD'S on the floor in a temper and broke them

then I bawled my eyes out becuase I was so upset that I had broken them coz OH had bought them me for my birthday.
Its totally noral, hormones are all ove the place! think next time I am going to try some homeopathic remidies throughout my pregnancy and also in labour xxx