Hi Kelsey, firstly, if you are diagnosed, Type 1 there is absolutely no way on the planet that you should have ever been prescribed Gliclazide.
The drug leaflet in the packet says "Do not take Gliclazide Tablets if you have insulin dependent (type 1) diabetes."
I suggest that you stop taking it and get in touch with your surgery immediately, and don't take any fobbing off. It is so far from the NICE guidance to prescribe this drug for type 1 that whoever did so is being directly negligent and failing to meet their duty of care.