Glad to hear that BIGAL and eldon have gotten you back on the tracks.
You should explore the -DWGUNITS command, which is quite informative and helpful
in such situations. I suggest increasing the commandline history window to about 6 lines,
to give you some overview of the conditions in your drawing.
I would open a COPY of a file, and play around with it, until you feel you understand the functionality included.
READ the commandline prompts very carefully, don't rush, so that you better understand and remember.
The numbers displayed <THUSLY> indicate the current settings in your open drawing.
For instance Unit for length <3> means that the drawing units are currently set to Millimeters.