Hi Schaden, so sorry to hear about your husband
it's a miserable disease.
I find stress a HUGE trigger for a flare, so that's something to keep in mind long term. Hopefully the steroids will help and get him into remission which can then be maintained with other drugs.
Colitis & Crohns UK are good for advice, they have a list of leaflets here I found the ones for employees / employers very useful to use to make work aware of what I was dealing with and what their obligations are. Often people hear IBD and think IBS, which isn't helpful.
Also, he's disabled under employment law, and has the protections and rights that gives.
My local hospital where I'm under gastro care has a phone and email line to the specialist nurses, which is very good, and they can help with adjusting medication and advice without having to get a hospital appt.
Also he can get a radar key.
Best wishes to your husband.