Jill, I'm the same. For three weeks I've put on, the first week (+2lb) I could understand why so I cut things out and made sure I food optimised in the second week, but I gained (+1.5lb). So the third week I made sure I had a third of speed food and snacked more but I gained again (+0.5lb)
This week I'm trying again... Making sure I drink more, making sure I eat MORE speed food (I've gone through so much frozen veg in these past few weeks), I bought a bottle to ensure I drink more water, I had little tubs which I fill with fruit to eat... If I don't see a loss this week then I've no idea where I'm going wrong. My healthy extras are Weetabix and skimmed milk, though I never manage to use the full 350ml! I've made sure I've kept most of my syns until the evening (consultant advised this).
It's like my body had become complacent since hitting target (which I wanted to change and of which I'm now not at.) I know I have around 21 months to get to where I want to be and I know I've done well with losing what I have but now I'm scared I'm going back to the way I was.
Anyways, I'm going to sleep. I have an Asda delivery tomorrow full of good food, my breakfast is full of speed food and is in the fridge ready for tomorrow as is my bottle of water.