If you are normally a POSITIVE person I think that this is just a spurt of unhappiness with all the stress around you right now. I hope that you can motivate yourself somehow to keep going. I would start with the mailing as gifting to someone may help lift your mood because you are a kind and generous person!!!
I hope that this will pass for you very quickly. Try not to hold on to the things that you cannot control like the kids and their dispute. you can help talk with them but they will do what they want anyway. Try to keep your UP'S going. and if you find it getting harder and harder please talk to someone. we are here for you to vent so if that helps then vent on......