I have no real advice to offer, but I did want you to know that you and your family have my utmost respect.
That said, are you aware of this thread? I understand it's frequented by current and retired military and their families. Perhaps the folks there will be able to offer some support. Praying for your sanity and his safety.
there are many boards out there as support for military spouses...
write letters every single day... send care packages... involve your kids... put up a calendar and x off the days... check with your military ombudsman for support and suggestions...
don't take the alcohol route. Little good comes of it...
do focus on being the best person you can be during SO's absence and try to get some projects done while they are gone....
take it one day at a time and remember as bad as you have it, SO has it much worse... keep them and your kids as your primary focus.
Talk to friends, talk to the base ombudsman, talk to families that have been through this with Vietnam, Korea, World War 2, and the first Gulf War. If you can't find a starting point, go to this web site: http://www.militaryonesource.com/skins/MOS/home.aspx (copy and paste it to your browser window).
Start with the help now, don't wait until you feel overwhelmed. The meetings, lectures and pamphlets that you should have received pre-deployment can only do so much, it's reaching out to people that have been through this that has the best benefit.
One way that I've found to help cope with having a loved one away on service is to do volunteer work that would benefit them. Help put together care packages for the soldiers, have the kids send cards/letters/photos. But please don't turn to anything self destructive to help you cope. There's plenty to do in your community to help keep your mind off of it.