What have your feelings got to do with your writing. When a doctor gets up in the morning to go to work, he doesn't consider whether he is genuinely interested in his work that day. He has work to do - he does it.

Passion is not required for good writing. What is required is a highly active brain that is informed about many different things. The brain and the memory are responsible for a constant source of topics. In order to do that, writers have to read constantly. It also helps to constantly explore.