I treat Helicobacter pylori with drugs: Metronidazole, Ospamox, Ulcamed, Dexilant - it began to hurt me in the kidney area and the pain in the left side is more severe than before taking medication - is this the correct symptom?

The use of the above-mentioned drugs is associated with the risk of side effects mainly from the gastrointestinal tract (e.g. disorders of the intestines, liver), which may cause, for example, transient pain in the abdominal cavity. It is difficult to judge from the description whether your problem concerns radiating abdominal pain or whether kidney pain is actually a cause for concern. When using such a treatment, it is worth drinking a lot of still water to further improve the work of the kidneys (and not burden them). If the pain intensifies, you should consult a doctor. I encourage you to read: https://www.gdziepolek.pl/kategorie/leki-na-helicobacter-pylori https://www.gdziepolek.pl/artykuly/jak-leczyc-wrzody-zoladka-i-dwunastnicy