I have not had a single attack since I started on time release nitroglycerin tablets. Before that? The queen of the rainbow.
My first noticeable issue with Raynaud’s was in the early 80’s and my doctors kept telling me I must have frozen my feet and fingers. I’ve lived on niacin for years being the mainstay. My plan is not to let an attack continue over 30 minutes due to damage that could happen (and has). So a winter walk meant fast-acting niacin in my pocket, besides all the other 9-1-1 things to do.