I see, you mentioned it's happening outside of work too. The eyes flickering and body spasms sounds like it's affecting you quite a bit. I unfortunately can't think of what might be causing it. Did you have a stutter as a child? I'm a speech-language pathologist but don't specialize in fluency disorders, and tbh it was my least favorite area to study as it was too confronting for me 😅 But it might be worth seeing one, there are many programs that have helped people to reduce their stutter. However if you don't want to see an SLP I understand. In a nutshell, most of the programs focus around practicing a speaking technique that's really slowed down and smooth (at home, not in front of others). You focus on starting each consonant gently, and you 'breathe into' the vowels (imagine putting a 'h' sound in front of the word 'and'). It's supposed to relax the muscles in the throat so they're less likely to tense up when you speak. And as you feel more control over your speech, you gradually practice speaking more quickly but still using that technique. If there are certain sounds in words you find trigger your stutter more (like for me, it's the 't' and 'k' sounds for some reason), or even just common words like the company name, you can make a list of words starting with those sounds and just practice saying them everyday with a really gentle onset, like 'h---kite' trying to ease into the word. It can also help to write a hierarchy of where your stutter is most to least severe, e.g. at work versus relaxing with friends, and practicing your speaking technique in the least stressful scenarios then building up to the ones where you feel more pressure.