I'm kind of wondering whether this is a real complaint or a joke (and a fairly funny one at that, what with the Taco Bell induced panic attacks and all).
"[I] could not get my concept copyrighted or patent[ed]"
No, you could not. And the reasons why are the reasons why your complaint has no legs.
First, copyrights don't apply to "concepts." They are for books, music, movies, etc.
Patents ARE applicable to concepts, but there are certain requirements. Primarly, the idea must be "creative." I'll grant that your idea arguably meets this requirement.
The idea must also relate to something new, or a significant modification to an existing item. You would run into trouble here. Your idea is just far too general. Had you devised a particular flavor you could have a case, but the raw idea of flavored taco shells is just too broad to enjoy legal protection. On top of that, it could be said that taco shells are already flavored: they taste like taco shells.
Further, granting one person rights to the idea of flavored taco shells would create a monopoly over a concept that, as was stated above, is probably thought of by many people every day.
Not to mention that the shells in question were colored, not flavored.
This is not to say that your idea isn't a good one. It's just too broad. And I highly doubt that the people within Taco Bell who heard of your idea have ever even communicated with the people who devised the shells in question.
Go back to the drawing board. Come up with something more specific and unique. Let this issue go. And if this kind of thing causes you the hardships and stress that you speak of, I would suggest a different hobby.