Personally, I think it is deficiency of both heart and spleen, and the stagnation of liver qi aggravates the symptoms of deficiency of both heart and spleen. Poor liver qi leads to irritability, which affects the spleen and stomach, which leads to burnout, poor appetite, fullness after eating less, bloating after meals and other symptoms. If the mind can't be God, it will lead to insomnia and many dreams. The general symptom should be deficiency of internal yang, so you should also have gynecological symptoms, such as delayed menstruation and stagnation of liver qi, which can't push menstrual blood down, so the menstrual flow is less. If there is cold in the uterus, the blood color is dark, there are blood clots, dysmenorrhea, abdominal distension or backache during menstruation, and pain is the most serious on the first and second days of menstruation.

Looking back, oral ulcer may be caused by cold or lack of sleep. You should ignore this symptom when treating it. When you are cured in other aspects, sleep well and the oral ulcer will heal itself.

The above is only my humble opinion. Please consult a doctor of traditional Chinese medicine for face-to-face treatment.