I agree with you that it is overwhelming. For me stutter and speech block is not only mentally exhausting and painful, but also physically. When I get speech block, I sometimes have to clutch my hands really hard in order to get words out. I envy people who can converse easily. But one of advices that I got on this post about breathing out through nose when I am about to say a word really helped. I practiced that technique a lot yesterday, and I could feel some progress.