Believe me I hear you! I that also used to be my exact problem when I was at school -- between classes, my job, my internship, my volunteer responsibilities and my homework, I felt like I never had any engergy nor time to work out!
However, last semester I made a change to my whole lifestyle and it worked wonders! I have to ask -- what does your DIET look like???? The first think i did was start to keep a food journal and realized that even though from time to time i though i was being healthy by eating ONE piece of fruit, or ONE salad, essenitally ALL my calories were coming from carbohydrates -- the starchy sugary kind! come to find out (after reading up and doing a lot of research and being on boards like these) my blood sugar was ALL over the place which was creating spikes and drops in my insulin levels, all which has a major impact on how you feel mentally and physically. Your body is caught in a constant battle between high energy rushes (which dont last long) and low sluggish periods (low blood sugar).
Anyway, I made some major changes in my diet and in just one week noticed a big difference in how i felt. I felt like i had more energy throughout the whole day instead of just in short bursts, and i also started sleeping better, which of course led to me feeling even more rested and efficient the following day. I wont go into too much detail on what i eat now but it is basicallyt he staple of good eating -- lost of fruits/veggies, chicken, fish, yogurt, cottage cheese, whole grain cereal and breads etc etc. also i eat every 2-3 hours which keeps blood sugar stablized. If you reply back with what your diet currently looks i (and maybe soem others) can give you some feedback on how it could be improved.
also, after the first week of changing my eating, i finally felt i had to energy and newfound motivation to make myself go to the gym for at least 30 minutes 6 days a week, and guess what? by working out, i wound up feeling even MORE energized throughout the day. its been about 7 months since I changed my whole lifestyle and i've lowered my resting heartrate by 20 beats/minute (meaning good cardiovascular health), can run about 7 miles at a time, and i usually only get about 5 hours of sleep a night -- and i STILL feel energized through the whole day!
sorry this is so long, i dont mean to overwhelm you, i just wanted to share my story and show how i was in the same boat as you and how easy it was to come this far, as long as you try to make your goals reasonable and realize that there is no quick fix to your problem, especially considering your daughter isnt going away any time soon lol, and you'll soon have another person in your family! congratulations by the way!
so reply back with your diet if you want, and do whatever you can to try to squeeze at LEAST 20 - 30 min in of exercise a day. i promise that after a week or so you will start to notice that the exercise actually helps you feel more and more energized! (plus, you can accomplish a lot in two months so you look fabulous in your dress! if that's not motivation enoug i dont know what is!