Hi and welcome,
We have all fallen off the wagon so don't beat yourself over it at least you have realised you now need to get it sorted. I was diagnosed at the age of 6 yrs old and am now 43.
What insulin have they put you on.
I wasn't a well controlled diabetic until about 7 years ago, but i have suffered some side effects.
At least you are seeking help.
All i can say is test your bs regular and keep a record of what you eat and what your bs were at the time.
You may find you need to eat small but more regular meals and adjust your insulin slowly. Try not to inject in the same spot all the time.
When my sugars are high i find if you can do a 20 min walk i find it can bring my bs levels down a bit.
Hope this helps for now.
Keep in touch if you wish.
Remember we can only go by our own experiences.
Take care
Tracey