Hi pixie,
I'm the same.
They say that after you've had a baby this can happen,and it's hormonal.
I was certainly like that then after having my children and now I'm worse I would say.
Like you I go into a room for something and get there and think,whatever is it,or I will do something completely different, go back and then realise that that was not what I wanted to do/get.
I do stupid things too like filling the teapot up with teabags instead of the tea caddy.
Putting the cereal in the fridge and the milk in the cupboard.
Once I went to get a plastic box out of the cupboard and inside was the cheese