friend do not bother, be always brave hardheartedly!
according to Ayurveda all speech related problems stammering
etc. are due to Vata dushti specially Udana vayu..
go for Ayurvedic specialist !
1.in Ayurveda there are some meds like vacha (name itself suggests its usefulness in curing stammering) which is very helpful to you.
2.also,nasya with medicated oil would be fruitful.
along with above said
all these really help to overcome your problem
Wish you a nice Speech!!