Your description suggests symptoms of anxiety. Many a times anxiety, worries, tension, negative ruminations automatically occurs in the context of some coping issues or stress levels. You need to start noticing these emotions in this context and don't fight with these emotions, nor react to them. I think you would benefit from few sessions of cognitive behaviour therapy to adopt few techniques and skills to overcome this. Also, read about mindfulness techniques and get into good lifestyle choices like yoga and meditation. If the symptoms worsen or the impact is too much, then you may even benefit from some medicine. It is also worth checking your
thyroid functions and haemoglobin levels. Regards