My stutter can fluctuate, too. I don't speak a ton (unemployed and single: two great tastes that taste great together!) so I volunteer at a tank museum. Lots of small interactions. Lots of times I can try again with people I will never see again. But, when it all goes to shit and I start to stutter on every word I go back to basics. Remember to breath. Slow my rate down and ease into the first sounds. Stuff like that. It doesn't always work, but I'm doing what I can, and that's a positive. Getting thru the shit is some of the hardest things to do. I would suggest stop hiding it. It takes SO much energy. That is, however, a step you may not be ready for. Which would be fine. You need to do you. Your comfort zone is called that because it's comfortable. But birds got to fly, and other metaphors!!!