Need Help with Stuttering

Need Help with Stuttering For the context I don't know exactly what my issue is as I've never been to a specialist but since my problem has started to reappear I am planning to see one. I stutter a little and speak very fastly whenever I get nervous. It gets even worse when I am not even able to speak or frame words. And when I am put on a spot, I am not able to pronounce some words. I hate to repeat myself again and again. Also I can speak clearly when I put my mind into it and become conscious which makes me wonder is my problem only psychological. Please guide me. 1. What kind of therapies or self-excercises can I try? 2. Can it go permanently? 3. What kind of a specialist should I see?