Stuttering with numbers after being a FO in Afghanistan.

Stuttering with numbers after being a FO in Afghanistan. Hey guys. I don't know if it's a brain injury or just a stutter but when I say numbers I get a twitchy jaw feeling and can't get the numbers out. I read off grid coordinates for airstrikes and now can't read any numbers off for the life of me. Fine all deployment and after that I just can't.