Do we need to add extra calories when exercising?

I am 8 months post op and this last week I decided to get back to exercising again. I walked on Mon, Tues, and Wed for 45 minutes on a manual treadmill (I didn't finish the week due to a surgery). I did not do any weight training this week, even though I usually do 2-3 days a week. I, also, logged my food intake on Mon, Tues, and Wed and my all time high was 1000 calories (and I felt like all I did was eat, eat, eat that day...due to pms and stress), with the other two days being 800-900 calories. Well, I got on the scale today for my weekly weigh in and have gained two (almost three) pounds this week! The frustrating thing is that when I don't exercise I seem to lose 2-4 pounds a week! I should also mention that I am back in ketosis...and no, I'm not losing inches either. So, my question is am I not eating enough? Do I need to eat more when I exercise to compensate for burning those calories? And if I do need to eat more, how do I get more in? I already eat lots of meat, cheese, nuts (which bring the calorie intake up quickly) and protein drinks. I also drink 90-100 ounces of water a day. On the day when I did hit 1000 calories, I was really sressed and binge-y and was full and icky feeling all day because I did eat so much! And if I don't exercise, is 1000 calories too many then? I am so confused! I would still like to lose another 30ish pounds and I'm afraid I just won't get there, especially if I'm already gaining weight at this early on. Thanks for your help!

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