I'm sorry, I know how much that sucks. I had a really bad stutter a few weeks ago while I was leading a group Zoom chat with a professional guest in attendance. UGH. Personally, I find it helpful to stop, take a breath, and say, 'Sorry, I've got a stutter.' Then just continue. I wish this wasn't the hand I'd been dealt, but it is, so meh. Believe me, I know how embarrassing and frustrating it is, but hang in there. One thing I've learned over the years is that no one cares about this as much as you do -- everyone's focused on their own issues.