Why do I need ANOTHER class?!?!?!

I went to my endo today. I’ve been on insulin before but after my son was born my numbers were so good I quit taking it. So I’ve been maxed out on Glucophage for several years. My dr just tried me on Glipizide. I went for my follow up today. Apparently it didn’t work :-( I’m starting on insulin again. He said oral meds don’t work on me. I’m so mad. PLUS he’s making me take an insulin class although I’ve ALREADY been on insulin and I’m a freaking nursing student and I know insulin and injections inside and out. Heck I give insulin to my pts in the hospital! Just another way to get money I guess.