English Grammar

Hi English professionals,please correct my grammar mistakes,thanks.'I felt extremely tired yesterday hence I drank a copious amount of coffee and I am suffering currently. My heart is quite painful as I have had diarrhea since yesterday evening therefore I have to apply one day’s leave today. I thought I had recovered from IBS but I was wrong. I am really not sure if I am unfortunate or fortunate because I found a new website yesterday afternoon where I have learned a few new words from some English experts and the unfortunate thing is that my cell phone battery has been spoilt. '