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My husband has been T1 for 23 yrs. Through the 12 yrs of our marriage he has had to change his dosage a couple times and changed his insulin type once. My point is that sometimes the body does change in which the insulin regimen needs to be adjusted. My husband has had similar types of reactions over the years. But your do sound a bit different. The body temp. dropping doesn't happen to him. Everyone reacts a bit differently, but it sounds like maybe something else is going on. I haven't noticed any long term effects for my husband.
If you really feel is personality is changing, he should be examined further by a doctor. That's what I would do.
Good luck and keep us posted.
Marcia