Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. In your case, self humming of songs are not at all a mental health thing. Instead it is clearly healthy. We often ask people with mental problems to sing or hum songs which they like. Such an exercise keeps their mind away from unnecessary thinking and thereby other related mental troubles. Means, you are healthy otherwise and do not relate the humming with mental illness. Actually it is entertaining. Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition. Hope this answers your query. Available for further clarifications. Good luck.