If your body is not showing any serious abnormality as you have mentioned, no need to worry at all. In any head injury feeling of vomiting followed by serious headaches(not minor) is need to be diagnosed. Your bump will die within a week.
To,
Designation of boss
Company Name
Mention Place
Respected Sir,
With due respect I the undersigned want to mention that I will remain in leave from --- to ---- on account of------
If you will act on my request I will ever thank full to you.
Yours faithfully,
(Name)
designation