Definitely get in touch with Diabetes UK and ask for help from the Advocacy Service. They can often help when no-one else can.
I'm not an insulin user myself, but I wonder what kind of insulins you are using. If it's the modern synthetic analogues, could you get your Healthcare team to try you with animal insulin. You might be less resistan to it.your doses sound huge. You might end up needing U500, which is high dose stuff and very expensive. It would be in your PCT's interest to try to find a better solution.
I appreciate you asay you weigh your food to provide 15g carb per meal. I suspect you may need to increase your fats to help.
Hana