If it is disturbing your daily activity...you may require medicine along with cognitive behaviour therapy...

You have realised that you are having overthinking and trying to improve it is the first step to get rid of it. Make yourself busy, spend time with family and friends. Do yoga and meditations. If its really troubling you take help of some mental health doctor and counseling. If you want to have online consultation with doctor and put your query in detail visit this link: https://www.hamrodoctor.com/doctor/dr-subodh-dahal/