I feel like the best way to overcome blocks is before you speak, do a small exhale of breath and then speak slowly. If you start to have a block. Stop talking , take a breath, exhale a small breath and try again. This is what has worked for me, maybe it will help you Maybe changing the way you approach the stuttering wholesale will also solve the eye issue….? I’m not sure about that but I thought I would throw it out there Be kind to yourself , have a wonderful day