When I go to the pharmacy I write down the names of the meds I need and if I completely Block when trying to say the names I just show them the note. I know that this obviously doesn't work while speaking on phone, I rarely speak on the phone myself, other than speaking with my family members and even then I sometimes get severe blocks. If this happens I often swear like "f#ck this, I cannot say it!" but my family members encourage me to try until I succeed. Sometimes what helps me is tapping my fingers at the back of my other hand to kind of give a rhytm to my speech. Sometimes it helps and sometimes not. (sorry for my English, it isn't my mother language)