Why Am I So Overwhelmed?

I don't know about you, but I am feeling really overwhelmed right now.  It seems like I can't get a handle on all of the school stuff going on, and any other things on top of that just make it worse!  I don't know where I would be right now if the girls were doing sports this year.  We've got two different school projects going on right now, Maryland State Assessments start tomorrow (for the same two girls that have projects due), we have to keep practicing math facts and reading AR books, and on and on and on.  It's just too much!  I find myself checking the calendar more than the girls do to see when Spring Break starts so I can have a break.  This has led me to wonder where I'm making a misstep with the school stuff and how I can correct it. 
Not hovering enough?  Emily has taken me by surprise more than once because she "forgets" to tell me about a project she has until the due date is fast approaching.  I get so frustrated and fuss at her, but she keeps doing it!  So, am I not riding her enough?  She is almost 11 years old and starts middle school in the fall, so we've been trying to give her more responsibility in regards to her school work.  I have been asking her what homework she has to do each day and leaving it to her to actually tell me what it is.  Lately I've been sitting down with her and her binder so we can go over assignments together.  I would like to be able to just ask her and have her tell me what she has to do, but that has backfired on us too many times here lately.  My hope is that eventually she'll take more and more responsibility for her work as time goes on.
Not regimenting time enough?  Charles and I are big believers in play time for the girls and try to give them as much time as possible each day to do that.  However, this does cut into the time available for extra skills practice or reading.  So, where's the balance?  How do I fit it all in?  This is a struggle I've had since the girls started school many moons ago.  The last thing they need is schoolwork from dawn to dusk, but sometimes it feels like that's what we have to do to fit it all in!  We've started trying to get them into bed a bit earlier in the evening so they all have reading time before bed.  It's working pretty well most nights and definitely helps them get through books a bit faster.  I've also started fitting math practice in when they don't have homework so they keep their brains sharp.  I've also put a few math games on the tablet so they can "play" and learn at the same time! 
Worrying too much?  I think that sometimes I worry a bit too much about the grades.  I was always a perfectionist about my grades - anything less than a B on an assignment was something to cry about and heaven help me if it had happened on a report card!  Unfortunately my girls don't have that same problem.  They often can't be bothered to turn in an assignment if they're not reminded several times to do so.  It drives me crazy!  Their Daddy was just like that as a child and it drove his parents batty, too.  I am learning, though, to let go of the grades just a little bit.  If they work hard (and turn the work in!) I will be satisfied with the grade they receive.  I sure do wish I could infuse a little more perfectionism in them, though, and I don't think that's ever going to change!