Katie - like many others here have said, I think of you often. When my step-dad died in November, my mom sought out a griefshare class near her (it was about an hour away, but she went). It is a support group for those newly widowed. We (the kids) practically forced her to go. Here is their website if you want more info. Just plug in your zip to see if anything is close by, and its free.
GriefShare: Grief Recovery Support Groups
Also, if you would like to talk to someone who is a few months out from where you are (my step-dad died Nov 2007), pm me and I'll give you my mom's edmail address - they were married 30 years, so she knows how it feels. She has had a difficult time, they were very close like you and Buck.
I wish you strength for the days ahead, just take it one day at a time.