Hello Friend, Good that you are seeking a help here. It's like an addiction as you find happiness by doing it. You tend to ignore other sources around you that can give happiness. It's a mindset issues and with few behavioral changes, you can slowly overcome this.
Stamina is related with many other aspects of body condition, food, daily routines etc.
Suggest you to have holistic analysis of your condition to choose a right treatment method
Next Steps
You need to take a counseling session to open up your mind to have a better understanding. It will help to isolate the mindset and suitable solutions. Feel free to reach out to me online through Practo app chat for a detailed open discussion and suitable recommendations.