Hi redshoes - don't fret about getting your kcals bang on your target - most people reckon within 100 kcals either way is fine. I am nearly always under - but not by much.
I tend not to friend people on MFP I'm afraid, because stupidly I didn't make my account anonymous enough and my user name is quite identifiable.
I'm veggie, so my evening meals would probably be slightly different to yours. I eat a lot of home made veggie soups and stews, jacket potatoes, salads (which I always make really huge and include lots of different types of fruit/nuts etc, home made ratatouille (basically pasta sauce without the pasta) quorn with steamed vegetables. I find it much harder in the winter, as I eat lots of different salads in the summer and am happy to eat it for lunch and evening meal. Winter meals tend to get a bit repetitive and boring. I could do more interesting meals, but have always run out of steam and motivation by the time I get around to cooking the evening meal and I hate cooking two meals, so it has to be something the dcs will eat (not easy when one is gluten free and has a list of foods he won't eat for sensory reasons
).
As for the exercise high, I found it really tough going at first and had to push through the horrible hot, sweaty, exhausted feeling. I really didn't want to do it every day and had to force myself. aI think it took a good month before I started feeling better afterwards. I am struggling again at the moment, having restarted after a month off. Still working through it again. I definitely find it harder to motivate myself with both diet and exercise in the winter as well, am pretty sure I'm designed to hibernate really. 
Outof/Madwoman I reckon that 3lb loss is a genuine loss. Dehydration would most likely show up as a gain rather than a loss. So well done! 
I had a sneaky weigh in as well and am a pound down from last weigh in, but I know its down to the upset stomach I've had this week and am half expecting it to go back up before Friday's weigh in.
Have managed a workout every day so far this week (all two days of it
) but just the two kickboxing circuits of BFBM rather than a whole shred. I daftly tried to tag on a level one shred afterwards yesterday, but only made it through one and half circuits.
Was a bit
about it really, as before Christmas I was able to do a full shred followed by 2-3 circuits of BFBM and still feel good afterwards. Still, its better than not exercising at all and at least I enjoy the kickboxing.
Going to shred today as I'm fretting about that blooming fancy dress outfit and want to work on my arms.
I was upset by all the threads yesterday about how clothes sizing is much larger now than it was in the 80s. According to those threads, being a 12 now means I would have been a 16 then.
Really demotivating when you've worked your arse off, literally, to get from an 18 to a 12.
Not to mention that means I would have been a size 22 before I started losing. 