What is the "reason" you have for getting the flu? You are not well, why do you need a reason; look at how you can get well again. Think of the depression as the illness it is, it is not a reflection on you for getting ill; being ill/depressed is not a "prize" that you merit! Work with your T to make yourself healthier so you can fight off the illness, it doesn't matter so much where it came from. We all can become healthier, even T's.