Yes, I have absolutely experienced writer's block. For me, what helps is stepping away and finding inspiration in music or other media which resonates with the emotional feel I am seeking.
I would tell myself to keep writing and not to be afraid of trying. Succeed or fail, not trying is the worst I could do to myself. Never let your imagination grow stagnant. Embrace it and let it blossom.
I have had the desire to write since I was young, but it was only in the past couple of years that I have really begun to embrace that desire. The spark which got me back on my passion was the birth of my daughter. I read to her every day and the light I see in her eyes reminds me of my own excitement with embracing stories.