My daughter is type 1, and was diagnosed at the age of 26 which is a little later than the norm, as most are diagnosed in childhood or their teens Hannah injects four times a day too. She was very ill in 2013 when she collapsed in her flat due to DKA. She was very lucky as her work colleagues raised the alarm and she was found just in time. She spent a week in intensive care and a further two weeks in hospital.
Hannah has always been very thin but when she was first diagnosed her weight had plummeted as her blood sugar was rising. When her diabetes is well controlled she does put a bit of weight on.
How long has your husband been diabetic for? There are some really good Facebook groups, where he would find a lot of support.
https://www.facebook.com/groups/type1rantandmoan/?fref=ts This is just one, but it would be worth him checking out some of the others. Has he done a DAFNE course? Hannah is hoping to do one very soon. Does he see a dietician? Hannah has found the support for adults really poor.