Anyone had any success with speech therapy?

Anyone had any success with speech therapy? So Im stuttering since I was a kid... as English is not my first language, it's harder when I communicate, especially over the phone, in interviews or in person, mainly with people whom I don't interact with at all or have never spoken to, it gets worse when I'm more nervous... or when I don't communicate in English with anyone... I also stutter in my mother tongue but not as much as I do when in English.. I'm over 25, btw. Any advice on how to cure this?