So, your exposure consisted of fingering her vagina and masturbating yourself, correct? Nothing is going to make you feel malaise the very next day that is std related. Are you anxious and depressed? That can be a symptom of a mental health issue too. Your other symptoms that developed are continued fatigue, burning eyes, middle and left chest pain and whit tongue with oversensitive mouth? I really do think your symptoms point to anxiety. So, your masturbating yourself is NO risk. You can't get an std from self masturbation. NOTHING is commonly passed through fingering. NOTHING. Fingering her presents very small risk if you had cuts on your finger. Hepatitis B is not commonly passed this way. HPV, syphilis and herpes are also NOT commonly passed this way. https://www.catie.ca/en/practical-guides/safer-sex-guide/understanding-risk-sex-act
White tongue would not happen from your exposure either. do you use tobacco products? https://www.medicinenet.com/white_tongue/symptoms.htm
You had no risk from this. Fingering doesn't transmit any infection. Even if you had cuts on your fingers, you're fine.
Also, like GuitarRox said, no STD would give you symptoms the next day.