hi there , welcome to HCM, Improper tooth brushing or poor oral hygiene can lead to various oral infections as it may enhance the bacterial and fungal growth in the mouth. swelled bumps on the sides of the tongue can be inflammed tongue papillae or oral ulcerations . oral ulcerations or inflammed areas increases salivation which leads to nausea. stress can also be a contributing factor that causes ulcerations consult a dentist and get the examination done. meanwhile. maintain good oral hygiene by regular tooth brushing and flossing the teeth. use antiseptic mouth wash like chlorhexidine for gargling or lukewarm saline water gargles gives soothing effect to the mouth. start with a multivitamin supplements for 7 to 10 days. i hope this helps, take care.