The guy who told you to see an osteopath is a little misinformed and had things a bit upside down. Osteopathy is basically just chiropractic and has the same pseudoscientific origins.
However, for historical reasons osteopaths are very different either side of the Atlantic.
In the UK, osteopaths are basically just chiropractors with pretensions. In the US, doctors of Osteopathy are basically just doctors who went to a school that teaches osteopathic nonsense alongside real medicine, and they are licensed and operate as real physicians.