Firstly, welcome to Social Slimmers
And well done for keeping a good amount of the weight off
You may have put some back on, but just remember the weight you've kept off too
For the hunger, try making sure you've got enough Protein foods in your meals. They are what keeps you feeling full.
Do you eat lots of pasta, rice, potatoes? As a previous member, I imagine you'll remember these should be in moderation, but not everyone does! make sure they don't fill more than 1/3 of your plate each meal time. I sometimes feel sluggish if I eat too much of them.
For the rest, like thistledown said, it could be because you've possibly changed your diet quite a bit and it's your body getting used to the new regime... Keep at it, and hopefully you feel better soon