Newly diagnosed, but other problems

My husband was diagnosed type 2 a few years ago ( on Metformin ) a few weeks ago he started having headaches. To cut a long story short, he's now on gliclazide and humulin.
He also has DCMand, an ICD and thyroid problems.
Is there anyone out there who also has DCM and an ICD ?
Curious to know if anyone had noticed changes to their DCM with insulin ?
Thanks

Thanks for the reply, you're correct about the abbreviations
he's only been on humulin for two weeks and we haven't seen any specialist doctors either at the diabetes clinic or the cardiac unit.
He's due to see his cardiologist in August and we're just waiting to get an appointment through for the diabetes specialist, having only seen the nurses.
I was just curious as to whether the insulin could interfere with his heart meds.
I tried googling ( big big mistake ) as there's all much contradictory info out there, all I did was scare the c**P out of myself !