Over thinking - I think you are unhappy about yourself.. May be Certain expectations or wishes  of yours aren't met by you.. Constantly worrying on what didn't happen, rather than what I can do to change the present situations.. I think you need some clarity and understanding about yourself..

I appreciate that you are aware about your issue and you are taking care it I also appreciate that you are approaching help from professionals! First of all clam yourself, you need to balance your thought. Overthinking leads to headache. Try to divert your mind into Positive things, try meditation and mindfulness. Still find difficult to balancing emotion then I suggest you to consult with psychologist to help you best. You can also contact me through Practo app.