Welcome to HCM,
It is a bit unusual to be diagnosed as Type I diabetes
as it diagnosed at slightly early age but I am sure now you are diagnosed with type I diabetes please take care of blood sugar by taking Insulin
injections as advised by your treating physician.
You also have neuropathy which may be due diabetes or it may be due to possible other causes.
You should get Nerve conduction study
which will help to diagnose peripheral neuropathy
Other causes for pain should also needs to be investigated by X ray
lumbosacral region and if required by MRI of spine which will let us know any root compression or any orthopedic cause.
Please do not worry such pain can be treated by neurotropic vitamins like B12 and Gabapentine and many similar drugs if it is neuropathy,and if any other cause is detected it can be treated accordingly.
Please take care