Capecitabine side affects

Taking this drug finished 3rd cycle
1st 14 days was 3,900 mg day had severe mucositis with bleeding gums &scabs and bleeding nose sick stomach caused poor appetite but no nausea or vomiting - then 13th day diarrhea and blisters scabbing on chest so I quit 18 days not healed doc reduced dose 3,000 day