Diabetes is like that... It is a balancing act and small things can effect your blood sugars.
Can you find a way to exercise indoors, and you may need to look at and be mor diligent in your eating habits.
Being winter and all the holiday goodies gets us and we have to real ourselves in...
Best thing to do is keep a diary of meals and activities and when you take your meds and blood sugars and set up an appt with your Dr. to go over these things.
I am glad you found a Dr who will listen to you and your doing great!!! Just something is going on and you need to watch it more closely.