How to act in the event that my throat hurts, there is also an unpleasant smell from the mouth and a bitter aftertaste?

Yes, it could have happened. Bitter taste and unpleasant smell can testify to inflammation of the throat or tonsils. Tonsillitis is also accompanied by a slight sore throat. It is difficult to propose a specific method of treatment based on such a brief description, but the first stage is symptomatic treatment. A pharmacist within his competence can propose over-the-counter remedies for sore throat, which we wrote about here: https://www.gdziepolek.pl/artykuly/bol-gardla E.g. Glimbax - a drug in the form of a solution intended for rinsing the mouth, which can be used to relieve the symptoms of inflammation of the mucous membrane of the mouth and throat. https://www.gdziepolek.pl/produkty/33134/glimbax-plyn/apteki?pvid=137908#internetowe Orofar Max - lozenges containing disinfectants and anesthetics. It has a bactericidal, antifungal and antiviral effect. https://www.gdziepolek.pl/produkty/57942/orofar-max-pastylki-lamelki-zelki/apteki?pvid=204952#internetowe It is also worth taking care of immunity at this time, which will shorten the time of getting sick and prevent the recurrence of infection: for example, Imupret - a drug used in the first symptoms of infection and during colds. It strengthens immunity and has antipyretic and anti-inflammatory effects. https://www.gdziepolek.pl/produkty/95856/imupret-drazetki/apteki If the above methods do not bring relief within 5-7 days, I encourage you to make an appointment with your primary care physician, who will adjust the treatment according to your current clinical condition.