I am trying to lose a large amount of weight 100lb+) and trying to do it sensibly and gradually (have lost it all before by living on boiled veg and water, and put it all back on again)
This time I'm doing it right - sensible meals, loads of exercise (walking 10k per day, cycling, bit of strength training), using a fitbit to keep track of everything, have given up smoking/salt/sugar, am drinking lots of water etc.
I've lost 1 stone 3lb in the five weeks since I started which is fine I think. I should be feeling better, right? I'm not. My legs and feet hurt all the time from walking, I'm hungry constantly (I'm not starving myself! Am eating proper meals, spag bol for dinner tonight, scrambled egg on toast for breakfast etc). It's revolting but what I'm used to is eating massive portions and lots of snacks, and I just never feel satisfied now. I miss cheese and chocolate and cake and biscuits and late-night salty chips/pizza 
Sorry, just wanted a rant.