I loaded up my mod, made a few changes including making a new worldspace. I then open up D.E.I.M.O.S. in the GECK to look at it's N9ExteriorPast cell to see if i can find the name of a piece of rubble i want to use. i find the name, go back to my mod, and every change i've made is gone. my backup is at a far enough point in the past where i'd have to basically rework every single aspect because all that stands is the environment and a few chairs, gone is everything i did with Actor values and Note modifications and lighting improvements, and it took weeks of work. Is there any way to get it back?

I looked in the "details" section of my mod and all it says is "TES4". nothing else is listed.

Did you mark the mod as Active when you loaded it? If not, then it won't save any changes to that mod, but it should ask you to create a new mod. But, if you ignore than and just ask it save changes, then it won't save unless it has an active file to save to.