Have you asked him what triggers the anger find out it's important for your safety and his. He probably thinks he's saving you. Try to find out if he's seeing any doctor/psych and if he's on any meds or new meds because at least to my ears withdrawing can be a sign a relapse may be starting. The good news is if he has a routine and is using any strategies he's developed you can avoid the worst of it. But it's up to him a bit there.
It could be illness but it might also be legitimate reasons. If he does have legitimate reasons talk to him find out what's going on what's upsetting him. You'll get clues usually if it's illness. Remember he is a man though not a mission to save. He will let you know if you ask when your both level. Find out.
I know it's hard. Let him know he is supported if he needs it, he may not want you "nursing" him so play it by ear. It won't be like a normal partnership however you can make it work and this may be just a phase. Ultimately though it's up to you both relationships work when both try. He needs to be ready too. Talk you will find out what you need to know. I'm serious about chatting when your both calm though! you want to know where you stand not have a whizz bang hurt filled fight. He'll let you know.
