I have become suicidal...now what?

I have become suicidal. I have family and friends who love me dearly yet I am plagued with debilitating health issues and intense self-hatred. I am seeing a psychiatrist, yet have a hard time opening up. I am unable to go out and do the things I enjoy due to said health issue and there is no cure for what I have. I am also unable to exercise and have tried several different psychiatric medications. Nothing seems to help. Has anybody been in this situation? What do you recommend? I am thinking about overdosing on narcotics. How can I tell somebody how I am feeling? I love life and admire it's beauty, yet I feel as if I am unable to live it. I am young, I am not even in my twenties, yet have been robbed of my youth due to my failing health. I am not one for self pity or to ask for help, however I am desperate.