Anyone experiencing this should do breathing technic's, through the nose, breathing with the diaphragm.
Even doing this for a few minutes before bed can yield very good results. slow 4 second deep breath in as your belly extends, and very slow 6 second breath out.
Do some research on the Vagus nerve and improving Vagal response, especially those with GI issues with overlapping cardic symptoms, it's good very knowledge to have and most Drs don't talk about it or put the connection together. Its something a Therapist is more likely to discus in regards to mind and body wellness, the Asians knew how to do it right all along.