I live with a person with Polyarteritis nodosa PAN, need advice?

I want to know about PAN, and how to take care of someone has this disease, what to eat , and if it’s important to do sports maybe , i want to know if he can be fine again , he has PAN since 4grade or something and now he’s 22yearsold .. He always feel a lot of pain, and he loses a lot of weight he’s 46kg and 160cm ..i want to know how to take care of him beside his medicine please … And i want to know if we had a baby ,the PAN will be in our baby or not?! And i want to know if i will have the PAN if we had sex