How to reduce physical pains from stuttering?

How to reduce physical pains from stuttering? I have been having to talk a lot recently and, as a result of this, I have been getting muscle pains from blocking in my neck and face and a sore throat. I don't know if it's purely because of the stuttering that I seem to get very physically tired but being so tense is exhausting. My question is pretty much what can I do to build up my stamina for talking and what can I do to minimise the pain from stuttering and blocking?