There may be various reasons. Hard work, poor sleep and so on. You have to figure it out yourself. I only can recommend to try CBD to reduce symptoms. It will help you to sleep well. For example you can buy these capsules premiumjane.com/capsules-pills/cbd-capsules-25mg-capsule/ quite good variant for beginner.
When we get sick, first of all, our mental state worsens and the level of stress rises, and this must be monitored. I monitor my general health and stress levels using the app. How do you deal with stress?
I absolutely agree with you, in our difficult times it is very important to control your overall health and heart rate. To do this, I use a measuring tool in the form of an application apps.apple.com/us/app/welltory-heart-rate-monitor/id1074367771 using a smartphone camera, it monitors heart rate variability and analyzes the state of the autonomic nervous system, tracking heart rate variability. Simply put, it tracks your body's energy and stress levels.