Hello everyone! We were diagnosed with laryngitis, my son has a cough …

Hello everyone! We were diagnosed with laryngitis, my son has a cough right now. We were prescribed injections and syrup. Now it's almost a month since we got sick, before that was gastroenteritis, then bronchitis, and now this. I don't know what to do, we're doing everything according to the doctor's instructions (((( And his lower teeth are hurting, gums swollen up too. Maybe because of this he has a weak immune system. I want us to get better quickly ???