参上

Jitsu wa jikijiki ni sanjō shite o-hanashi mōshiageru to yoi no desu ga, ano hi irai (dono hi na no ka, sore wa ato de o-hanashi shimasu ga) zutsū ga shite okiraremasen no de, tegami de shitsurei itashimasu.Although it would be better if I visited and talked to you directly, since that one day (which day, I shall tell you later) my headache will not stop and I cannot get out of bed, so please accept this letter.