Is it true that once you have gone to chiropracter you have to keep going?

No, of course not: One can see her primary care doctor for an evaluation. The doctor can refer to a physiatrist (physical medicine and rehabilitation doctor) if needed, plus refer to a physical therapy center if that seems likely to help.

That is the fear: You don't have to but that is how many chiro's make their money. Patients are often encouraged strongly to return (?Monthly) for "adjustments" that apparently do not cure you -- otherwise, why return? But you absolutely do not have to return unless you like spending money. Having said that, many people swear by their chiropractors. Perhaps they like the very expensive massage.