Over time I have learned to live without him. Then living with him. Our best recovery comes from inside ourselves. Its ok to miss him but not depend on him. Don't be scared for him... it will not help. Hes scared for himself.
Bad things happen to regular people too. Car accidents, disease, bad circumstances... but life goes on. Be strong for him and assure him you are doing your best. Send him inspirational books if you can afford it. Soft covers only! Anyway... reading and time to himself can be good/bad. Visiting is horrible... but it means a lot to him. You can be supportive of him but also put yourself first. Its about balance.
You will be stronger and wiser getting through these battles. You will grow and learnmore about how wonderful and beaurltigul you are. Its all about love. Just love and things will fall into place.