this is interesting .....my stuttering is very similar to your situation and i also speak another language as well to which my stutter is sometimes better or worse. people have also told me they don't notice my stutter which is a nice confidence booster. in regards to your blocks i would recommend filling up your diaphragm with a nice inhale of air and smashing right through with the word you want said, at least this is what i do when those dam blocks fill up my chest and throat.