All of life is selfish. We only have ourselves, our own life to live. We can't live other people's lives, we can't even "help" them without their consent. You eat, sleep, breathe, etc. to live; is that selfish? Not everyone has enough food, is your having enough and eating it selfish?

I have asthma and my area (Baltimore) is under a Code Red air alert today so I can't go outside; it is selfish of us to have fouled the air so I can't go outside but it is not selfish of me to have asthma. Bodies have various and different individual problems and yours apparently has bipolar problems; your body needs certain help to be healthier. That's not selfish. Yes, you could probably work harder to be healthier (by eating better or making sure you get adequate sleep, etc.) but some of that is also going to the doctor and therapist and others who can help you decide how best to help your body.