My case of Type 1 D came on after 1) exposure to infections after my first boyfriend, and 2) weakened immune system from heavy metals.
Been using supreme fulvic for the past three months here, it does a positive difference.
if you're in the states, bromide products in the food/cleaning/textile industries can be making a bad hit on the endocrine system. There have been some reported remissions of insulin-dependant diabetes from the Dr. Brownstein documentation on Iodine therapy, so it may be worth a look for you.
I'm really happy you had an extended season of insulin production, keep going!
Dr Lonnie Hermann on youtube has a pretty thorough documentary on his findings with both type 1 and type 2 diabetics (he focuses on mycoplasma and viral interference).
I hope this post gives you some threads to track things down on. Fulvic has a chance to make the difference in supplement absorbtion and toxin elimination, but of course, go after good reading first.