Can´t sleep

I have been so sleep deprived for the past two years that I don´t remember what it is like when you can´t sleep at night. Tonight I was fast asleep by 10:30 but David woke up at 11 complaining that his foot hurt and since then I can´t get back to sleep. I have been having this problem for the past month. I have too much going on at work and I just can´t turn off my mind!!!
I haven´t posted in a while because I haven´t been around much on the weekends and last week I was in Madrid. We have been spending time with my in-laws these past two weekends due to my father in-law's poor health. He is 90 and actually doing great for someone of that age but had a mini stroke about three weeks ago and since then isn´t quite himself and is a bit confused. He is driving my mother in law crazy. So, we and the kids distract him a bit and he forgets about obsessing over his failing health.
David and Elena are punishing me due to my increased traveling. Elena more than David but David is starting to follow her cue. Evidently Elena is a perfectly normal toddler until mommy walks in the door. As soon as she sees me she becomes this helpless whining little blob who pathetically drags herself on the floor following me until I pick her up. And I ask myself, Is this my fault??? Did I create this monster? I actually think I am harder on her than I ever have been with David. Maybe that is why she is so demanding of my attention...Whatever has caused this behavior, the truth is that she only does this with me. So it must be something that I am doing wrong. Or do kids just want to punish their mommies for kicks????
She is lucky that she is cute because otherwise I would sell her to the gypsies.