Table Imported From Excel - Query For Columns Into Rows

I have a table imported from excel(5 var fix and 5 val fix) like:

Var1 val1 var2 val2 var3 val3 var4 val4 var5 val5
Color Red Size 4 Height 2inch NULL NULL NULL NULL
Color Red Size 5 Height 2inch NULL NULL Length 1 cm
Color Red Size 4 Height 3inch NULL NULL NULL
Color Black Size 6 Height 1inch NULL NULL NULL NULL

I need the output as

Var --- Val
Color --- Red,Black
Size --- 4,5,6
Height 1inch,2inch,3inch
Length 1 cm

Var or val can be either NULL or white space. I cannot use a function.