Okay...so long as it was book on your kindle, you're snowball safe
School? On a Saturday? Jen, you really need a weekend, hell even just a full day to yourself. You're constantly running all over for everyone. Would Heather be receptive to you sitting down with her and just saying "K so the kids are all yours today because I really just need a break from everything for one day"? Jen, you are a Saint for putting up with all that you do.
I really think boundaries of some kind need to be established. I know you are a non-confrontational person but really, how much more can you take? You're probably as sore as you are because not only did you get a good work out but you're stressed. You know what stress can do to a person.
Got any caulk? For the window I mean.
Hang in there Jen