Motivation

OK so its week 3 of my diet and I lost 1lb. Hmm. After my huge weight loss in the first week this has done nothing for my motivation. I think, "This week I will really make an effort and lose lots of weight!", but then five minutes later I think, "What's the point?" This may explain my yo-yoing.
So what do I need to do to keep up my motivation?
I have tried all the usual things in the past, like putting a fat photo of myself somewhere prominent and convincing myself I don't want to look like that any more. Trouble is, I never thought I looked that bad.
Pick a goal and stick to it. I have a goal. I want to fit in a pair of jeans I could wear 10 years ago. At the moment I can barely fit one leg in to them so it seems unattainable.
Pick a smaller goal. I have no imagination so I can't think of one. Maybe I could try to fit in a dress I bought last summer which has never fitted. If I aim for Christmas and don't make it, how is that going to make me feel?
What about focussing on losing 1 stone at a time? That might be easier. I have 5.5lbs more to go until that milestone. That seems manageable but I have so much to lose that it makes very little impact on fitting in to my clothes.
I need help.
Back to the hypnotherapist for another session? I felt that the first one was a waste of time - she said she could also stop me from nail biting. No joy so far. After almost 40 years of it, it is a hard habit to break. She also promised me a free half hour session if I didn't think I had my money's worth. I may have to take her up on that. I am waiting for her to call me to talk over how I felt it went. She recommended another 2 sessions which I will probably also do as I have nothing to lose (except weight!)
Next time I post I hope I have something more positive to say, but if anyone has a suggestion on keeping motivated, I would love to hear it.