Fever is symptom of any disease. Itself it is not a disease. Likewise anxiety also. You need to consult a clinical psychologist or psychiatrist for treatment.

Hi, I understand you are anxious and you over think. You can talk about your worries with a psychologist. A psychologist will help you explore what is making you feel anxious. Do not worry with counseling sessions you will be fine. To feel better you can think about your positive qualities, be kind to yourself and reward yourself.

Overthinking happens when you think about the past or future things. You need to identify which is dominating your thinking time. You might be anxious about something that has happened in the past or worried about future. When you find yourself get stuck with overthinking, immediately get into the physical active mode. This will help you to stop and get active with something. Consult a psychologist for detailed discussion and insights.

Overthinking is a tell tale signs of anxiety and can consume a lot of your time and mental energy. It can leave you feeling drained and exhausted, unable to do anything. If it goes the way it is going it will soon take over your life and you will not be able to do normal daily tasks. So, it is advisable that you visit a psychologist and get to the root of the problem and overcome them. Meanwhile, what you can do to overcome the physical symptoms is: 1) Do breathing 2) meditation 3) exercise 4) progressive muscle relaxation