Dynamic Range Selection For Charting

I have three rows that each attempt to pull in data from a range on different worksheets. All but one return nothing but "#N/A" values. The one row returns values from the proper range. (User selections determine which row will have data).

Second, I successfully pull data from the row containing actual information into another row, using the following formula: "=OFFSET(E$36,CHOOSE($Y$1,0,1,2),0)" on a cell-to-cell basis. The value in $Y$1 chooses the row to look at, based upon a dropdown selected on another worksheet.

So I now have a row with =OFFSET(E$36,CHOOSE($Y$1,0,1,2),0),=OFFSET(F$36,CHOOSE($Y$1,0,1,2),0),=OFFSET(G$36,CHOOSE($Y$1,0,1,2),0) and so forth. I can find the last value in the row, but I cannot find a way to extract the address from that, and create a table that will use as a series the last 26 values in the row.

For reference, I use "=LOOKUP(9.99999999999999E+307,E49:FD49)" to determine the last cell with a value (gleaned from a Dueling Excel Youtube Video, - very helpful!).

I hope the above will be clear enough, but if not, I'll be happy to provide additional information / clarification.