I don't think this has anything to do with your situation, but when my daughter had a pain med change to methadone she started putting on weight, huge amount, I was concerned asked the doctor, God Like personality, he did not take blood work or check for sugar.

She was getting itchy, big time, then turned jaudice, he liver functions were off the chart, she was in liver failure under his nose and all he cared that she had to take methadone instead of transdermal pain releif.
I complained about the wieght to check for diabetes, he did and it was high, he said he was not concerned.

My daughter was on Seraquel and I was concerned about diabetes side effect. She ended up with a spider bite that turned into an infection, the bacteria turned flesh eating and she could not fight it, her sugar had been 480! She had to battle a month with an open wound and skin graft.

So always make sure to have frequent blood, and urine work, especially when something new is going on.

Dianne