Not direct experience with my children but myself and my husband have both suffered with mental health.
My husband had OCD. He still has it although I would say that he is in control of it now rather than it being in control of him.
Its really difficult but I would say that was very good advice by Dancingqueen. Use the time to rest and get a fresh prospective on the condition. Its so important to get some 'you' time and rest your mind, I know its hard when your full of worry but honestly its the best thing you can do at this time.
I can second that caring for a loved one with mental health problems can be extremely exhausting both mentally and physically and I don't think you realise just how much it effects you until you are taken out of the situation.
It actually caused a trigger for my own issues (they were always there though just needed a trigger).
The thing that I found hard was that DH would involve me in his rituals as a kind of 'double checker'. When I became ill myself I realised I needed to take a step back from that and realise that I needed to look out for my health and that I wasn't actually helping DH either.
DH was initially angry at me because he felt he needed the reassurance for this issues and we almost split over it as it became over powering. However once we got over that hurdle and I was no longer a part of his condition It actually helped him to detach from it.
However DH's condition was not so much personal hygiene etc but security issues. So lights, keys, plugs, documents etc.
It would take him hours to leave the house checking he had turned things off and locked the door etc. But he used to involve me in ways like checking my purse and, my cards, making me walk around the house with him. Pulling a plug out and then asking me repeated amounts of times if he's pulled it out!
So I started hiding my purse and just telling hime 'I have it, its safe you need to trust me' and lots of little things like that that enabled me to gain control over myself, in order to help him. Not easy when you see it causing him so much anxiety and that could be quite scary at times. I had to leave the home endless times until he calmed down.
Just writing this makes me realise just how far he has come, at the time it seemed like it was a black hole that we were stuck in and we were never going to get out of.
Now days it takes him 5 minutes to leave the house and I just wait in the car. And just the other day he burnt all his old receipts and cheque books on the fire (filled going back to the 2000!) Without it even being an issue!
So it can be overcome! keep going stay strong and make sure you get that rest bite that is much needed!
Your son is in good hands and it might be just what he needs to help break that cycle.