Hi! I'm new to this community but I thought I would answer from my personal experience, since I also suffer from blocks very severely. First things first, the introversion is hurting you. I say this as a natural introvert, being isolated away from people allows you to avoid talking, which is actually the worst thing for working on your stuttering & blocking. The MORE you talk & actively use techniques to manage your blocking, the LESS you will block. From what I know, blocks are strongly correlated to your stress & anxiety level. It's a mind game. The first time I started blocking was in junior high when I took a writing class & had to read my work aloud in front of a large group of people. Since then, I took speech therapy & began to work on it by reading aloud daily. I don't block as much when I read aloud regularly, especially focusing on my trouble letters. The technique I use when I feel a block coming on is this: I immediately relax my mouth/jaw, & begin taking deep slow breaths. Remember to breathe all the way down to your diaphragm, not just into your chest. If a block is already happening, EXHALE, take a deep breath, & calmly start over. You're more than likely holding in all the air you need to breathe while focusing on trying to get the word out. It's ok to start over a word or sentence when you feel a block coming on, or try filling the silence with a filler word while you focus on breathing. When I block while trying to pronounce my own name, I pause & calmly explain to the individual "excuse me, I stutter/have an oral impediment. I need a little bit of time in order to get the word out." This distracts me from the task of getting the word out & also helps me to breathe. Do not be embarrassed that you stutter or block. When you act ashamed, people feel as if they have the right to shame you for the way you speak. Also, I am not a doctor or licensed speech therapist! Please, if your corporate work environment is stressing you out this badly, consider seeking a therapist! Understanding the root of your stressors & how to manage them aids in reducing stuttering as well.