Brand versus generic. Vyvanse or lisdexamfetamine?

Yes, I do when it concerns Vyvanse. There is at least one company manufacturing Lisdexamfetamine that seems the same, but I just had one RX filled, and it was as if I took nothing at all. I am extremely disappointed in that I spent quite a bit of money and Vyvanse has made a tremendous positive difference in my emotional and work performance. I just found this out, this week, so I am unsure what I am going to do. I will speak with my Dr. and possibly the pharmacy and go from there. I have also researched the internet and apparently with Vyvanse, many many people are finding the generics
ineffective. I have never had this happen with another medication. Any suggestions anyone

"Generic medicines work the same as brand-name medicines
A generic medicine is required to be the same as a brand-name medicine in dosage, safety, effectiveness, strength, stability, and quality, as well as in the way it is taken. Generic medicines also have the same risks and benefits as their brand-name counterparts."

This is true for most people in my personal case it isn't.
I can't take generic drugs as they have no effect on me. For most people they do but everyone is different and are more or less sensitive to medications.
As I mentioned only brand name meds work for me which is very costly and wish generic drugs did work for me but they don't.