Good morning,
I am sorry you are so much pain. The positivity, speaking only positives, is great until your ***** falls off. And it does. I am sorry your friend is embracing the philosophy. IMHO, there is no way to be authentic when immersed in "life is only positive" craparama.
Real life is made up of both positive and negative experiences. I understand we can all try to be more positive, but not in the extreme. Extremes are always problematic. When latching onto positivity and then when something happens, you are isolated by that belief system. How can you honestly talk to someone when you are going to be met with, 'fingers in ears singing lalalal, I don't want to hear about your problems". I hope that makes sense.
I don't know if this could be a possiblity with your friend, but I'll mention it. There are times when an antidepressant can push people in a hypomanic state. When blending positivity with this, there is a problem
Keep posting and hopefully you will find the support you need.
Sabra