My stammer has improved a lot over the years, I still have some bad days and it still takes up a lot of my mind, but it doesn't bother me as much anymore, when it happens now I just get a block. I lived in Belgium last year and when trying to to say a few words in Dutch to people in the shop, (please and thank you etc) I found that suddenly my stammer came back really badly, it was like I was 11 again. It didn't matter what mood I was in, when I wanted to speak I just felt that heaviness in my chest and it wouldn't come out. What I think it was, is that I was just afraid of saying it wrong, I was just too unsure of myself and got caught up in my own head. I'm teaching myself Spanish now and I also stammer when practicing by myself, i havn't actually had to use it with anyone yet. If I'm getting caught on a new word I try to just say it slowly and exaggerate the pronunciation as much as I can. I don't know about others here but I think my stammer and tendency to slur my words are very tightly related. I'm hoping learning a new language will help me slow down and enunciate.