Hi
My son (diagnosed at age 11) had quite a pronounced honeymoon period. A few weeks after starting on insulin, his insulin dose dropped right down - so much so that we went onto MDI because he was so sensitive to insulin and it became a bit easier. He was only having 1 unit of Lantus (long acting) insulin per day and needed a half-unit pen to deliver the tiny amounts of Novorapid required for meals. He had a lot of hypos at that stage too.
However, things did very gradually change. There was never any sudden increase in insulin needs, although we noticed that we had to increase the units each time he had coughs or colds and thereafter it didn't go back down again. Also, we of course have had to increase units with his growth.
To begin with during the honeymoon phase, daytime highs mostly corrected themselves overnight and some of the well known difficult foods for diabetics didn't really affect him. This effect has diminished gradually too :-( but at a pace which has allowed us to learn to manage things.
Even now, aged 15, he is still on only half a unit of insulin per day for every kg of his bodyweight - and he has had type 1 for almost 4 years. I think that technically, this still puts him in what would be called honeymoon and certainly his consultant describes him as insulin sensitive. He has never had any ketones (yet!) - which I think is also a sign that he has some of his own insulin production still.
Hopefully, it will cheer you to think that you might not experience any sudden deterioration of being 'more diabetic' and that like us you might just gently move out of honeymoon in a manner which is not too difficult to cope with. (Well, no more difficult than it is to cope with anyway!)
In fact, I would say it has become easier for us since he moved out of the pronounced honeymoon phase because things are more 'predictable' than they were when his own pancreas was doing its level best to push out insulin in a half-hearted fashion.