Hello Looking, this is part of my daily experience. There will be some days that I get no waves, but it happens often enough for me to have accepted it as part of my cycle. What I've found helps is really connecting with my body when the wave comes, rather than merging with the feelings and thoughts. That has helped me to recognise what has triggered it: a past unpleasant memory, the fact I didn't sleep so well the previous night, is it too long since I last ate something etc.
I see the waves as something similar to what people with chronic pain experience. I try to greet it with, "oh there's that again", and just let the feeling be. It goes away eventually, and the more you try to fight it or merge with its lies about yourself then you will spiral.
