Diabetes in no control

My bloodglucose doesn't react to insulin at all anymore it seems, every time I eat my bloodglucose spikes and stays high even though I take 4times the insulin I used to. Worth mentioning is that I've began eating less and less because of this. I've also gone through many infusion sets on different places on my stomach but to no avail, the insulin just doesn't seem to do anything anymore. I'm 100% I've lost weight. My mental state is deteriorating. My core feels very hot as I'm writing this at 13mmol. I'm loosing hope.

I've been a type 1 since 2012.