Stay positive and keep moving even if it's one step at a time

Amy honey you have your hands full. I would suggest for the medication set a reminder on your cell phone, computer what ever you have that has an alarm on it to remind you to take those blasted pills.
For breakfast food.... Try to make it the night before. Think of it as spending time with the girls and cook with them. They will learn to cook and you get to get a great dinner in the process. I have taught both my sons to cook and they are very good at it (even if they can't figure out my chili recipe lol).
I make breakfast the night before if I know it will be hectic. I figure if you can heat up a bacon and egg sandwich (those you find in the frozen food section of the store) one night in the fridge won't hurt it (I leave off the bread part though).
I also cook in bulk for some foods (like lasangna, meat balls, soups, roasts, roasted chicken, grilled chicken). Anything I can freeze comfortably. Some weeks all the meals are done. I am making meatballs for dinner tonight (my take on a meatball sub is to put the meatballs, cheese and some pasta sauce in a pita bread). I will make 4 lbs of meatballs and freeze in 1 lb servings. That way 4 meals are taken care of. I use ground turkey and ground chicken. I don't mix them together. I add some bread crumbs from homemade bread (the guys got me a breadmaker for christmas), garlic powder, onion powder, salt and pepper. I throw some cheese in sometimes and other times I don't. Today in the chicken I will toss in some Feta cheese and oregano (kinda a greek flavor).
The exercise part is hard. I have Plantar Facities in both feet along with OA in both ankles and knees. I know how hard it can be when standing up hurts so bad you want to cry. You have to slowly build it up. I do mean slowly.
I do some of my exercise sitting in my chair behind my computer. Stretching and twisting at the waiste can help. Also you can lift free weights in a sitting postion. I don' think they cost much at Walmart. There are also ankle weights that you could do leg lifts with.
Riding an exercise bike is great for the lower body. Make sure that you get on it as your time for you. Maybe while the girls are cooking? That is when they know more about it.
Every successful diet plan has the phrase to stop eating when you are full and eat when you are hungry. The trick here is to understand when you are really hungry. Sometimes hunger shows up as thirst. Try drinking water and if it goes away no problem if it doesn't have a small protein based snack (like an ounce of cheese or a slice of chicken breast) just a little something.
It is definalty hard for me to do sometimes. I know how you feel about wanting to loose and not having it happen. That is the pits. Keep a food journal. I write down all the foods I eat in a day and I can reflect on it at the end of the day. Just be carful that you don't start beating yourself up for a bad day. It can be changed very quickly. Life happens after all.
Believe me life will get better. Stay positive and keep moving even if it's one step at a time. Some days that's all we can do and that has to be enough. Other days we zoom throught it all and then there are the days that we can just barely hang on to the ground we have.