Dail, Your are so young to have to go thru something like this! Know that you can come on this forum any time and vent/rant/rage/cry. I know you think you have to be strong for the kids but they'll know if you aren't being honest. Let them talk about their mom and if you can, talk to them about how you feel too. Keep her memory alive for them.
I am older than you and was quite angry when my husband died of cancer. My children are in their 20's and live with me...we've talked since day one about their father. I know some people prefer to almost forget that entire life existed and never want to say that person's name, but for us, we cry and laugh about stuff we know he would have a reaction to. If you have a church that you attend, maybe you can find someone there to talk with...otherwise this forum is pretty open for whatever you want to say. Good luck to you.