Allow yourself to feel those feelings. Don't deny them. Then, when you're ready, move emotionally past them. The fact is, the vast majority of chronic illnesses are NOT the end of the world. You CAN learn to live with this.
Every chronic condition is different.
Having a chronic illness is often isolating. You might think you're the only person in the world who has to spend time and energy hassling with what you have to do to take care of yourself. Arthritis affects 32 million. High blood pressure is a problem for 22.5 million. Allergies affect 20 million.