I was horrible in Tri1.... so angry all the time, I took everything out on my partner! We argued a lot.
It totally passed by about week 13 (only 15 now) - I can't give much advice on how to make yourself less grumpy. I talked to my partner about it, and asked him kindly, to be patient with me. I explained I won't be like this forever, but for now to please, just excuse and forgive my behavior. It wasn't easy for him, but he did it.