What you're describing sounds very similar to a panic attack. I have those symptoms a lot. I've found that some natural ways to calm me down is drinking hot herbal tea with lots of honey, wrapping myself up in a fuzzy blanket, and using essential oils such as lavender, peace and calm, and joy. Listening to classical music is a good way to calm down as well.
That's absolutely amazing that you've made it four months
SH free!! Congratulations!!