As a Spuffy survivor, I've direct experience with this because I had a very close circle of friends that had to travel this road, too. All I can tell you is that:

a. you're not crazy to have devoted years to a character
b. you have every right to your grief
c. time will eventually heal the wound although it may take more time than you expect
d. you will find love again eventually :-)

Well, I'm having a crap two weeks. I lost my first childhood crush and my latest fictional crush. Feeling depressed is becoming an unnaturally natural feeling.