My first primary care physician that prescribed hormones for me suddenly left from her practice in Missouri to her hometown in Montana. I just got a letter. I was just like you: quite upset and hurt. I felt like I was left out in the cold. In my case, I facebook searched until I found her, then friended her and asked her what Dr. she would recommend to take over my care. She actually replied, explained why she had to leave, and referred me to the Dr. I have been with ever since. I am 35 miles from my current doctor (I live in the country, too), but it is worth every minute of the drive to see her.
Don't give up. Go, seek, and find a new Doc. There are plenty out there!