I have been observing myself for the past 2 weeks that, I have become very lethargic, very negative towards everything in life. I am daily eating Junk Food, I binke eat. Till a month ago, I was daily running and cycling, have done few Half Marathons till now. But now, I am just not feeling like doing anything. I am playing a few video games, I am not at all active these days. 
How do I overcome this?