rogaine is good stuff but it works at its full capacity only in case of you're using it together with technique presented on http://www.save-your-hair.com
Rogaine doesn't do much, which means that if you lose hair after stopping, you won't lose much from stopping, because you never got much from using it. If you are losing hair, it's almost certainly from genetics, not from Rogaine. Please get yourself examined to find out for sure if this is true. If you are losing hair genetically, Propecia by mouth may be a useful option to consider. But you have not damaged yourself, so please don't beat yourself up on this.
Take care.
Dr. Rockoff