Could it happen such that a chiropractor do anything for digestive problems?

Chiropractor digesti: No reliable scientific data, however, if manipulative therapy relaxes you, and your digestive disorder is partly influenced by anxiety, one could see some benefit. Make sure to be evaluated by a physician first prior to seeking chiropractic care.

Not likely: By definition, "alternative" is different than modern western medicine. Generally any drug, herb, treatment, or procedure that stands up to rigorous scientific scrutiny is included in modern medicine. The problem is that many alternative practices, herbs etc do not stand up to scientific scrutiny and cannot be shown to work. They therefore remain "alternative". Be careful and watch your wallet.