Can a distinction be made between affliction by sorcery (sihr) and the evil eye ('ayn), and does the presence of H. pylori (stomach bacteria) constitute proof of sorcery?

The afflicted person is advised to take tangible means for treatment and not to directly assume evil eye or magic. A person suffering from a health problem should consult doctors and seek the apparent cause. Ruqyah is a means of healing, whether the illness is physical, magical, or from the evil eye, and one must seek tangible methods of treatment while seeking help from ruqyah. It is not likely that what he has is magic or evil eye unless there are strong indications, and each of them has specific symptoms.