I need professional help. Who Do I go to?

I am 23 year old female and i have issues. With my own life and especially my feelings towards my friends. Especially my ex best friend. I cant talk to her bc i emailed her and no response. I dnt want to push her away. . Oh and weve had a friendship of around 10 years before it got to this point. It's driving me crazy. Its making me depressed as well. Not majorly depressed, but enough to where it's distracting and it's making a big impact on how I feel about the situation. What can I do? Who can I go to other than coworkers and family? Help, Please!