Feeling some type of way :-(

I have a 13 yr old that just had major spine surgery less than 2 weeks ago and a 10 yr old that is extremely jealous. They are both at each other's throats, arguing and yelling at one another constantly. (This has been always from day one) I've just finished school a few weeks ago and stopped working as well in order to take care of my oldest after surgery and get ready for baby #3. Over the past year I've not had much quality time with either of them so me being home full time is something different for all of us mainly them. The are fighting for my attention and trying so hard to give them both what they need. Current situation, oldest has to have me 24/7 because of her surgery and the youngest feels she is getting all the attention so she said it was her "turn" to sleep with mommy ... To stop the fighting and arguing I let them both sleep in my bed while I attempt to sleep in the glider chair beside the bed that was bought for the next addition. I feel bad as a mom that I cannot properly divide my attention to the both of them and I feel overwhelmed :(