school stutter.. help.

school stutter.. help. my friend B and I have been struggling with a stutter our whole lives. i was in class today and I was so anxious about getting my words out that I started to stutter my whole question. I ended up stuttering for 30 seconds and everyone looked at me like I was crazy. I couldn't get my question out, and ended up going mute. I am very stressed in school right now that I couldn't even focus on getting my words out and the sutter just came. I had to ask the question after class and was very embarrassed, any advice on how to help me?