Disappearing Macros/Code in VBA

Help! I have worked long and hard on trying to learn the VBA/Macro coding BUT whenever I open my file after closing it, my macros that once were there are GONE. What can I do?

Thanks!

Check if you are saving your file as the type that is macro-enabled workbook. The file extension should be something like .xlsm instead of only .xls or .xlsx

Hope that helps.

Check. It is a .xlsm. I re-entered in the code again but now its not working! Any Ideas?