when he first read the pamphlet on this drug he was surprised by the list of possible side effects to it : upset stomach , ulcers , water retention , heart failure , potassium loss , slow healing , bruising , sweating , rash , itching , convulsions , dizziness , headache , adrenal gland suppression , diabetes , blood clots , insomnia , weight gain , nausea , vomiting , euphoria , mood swings , personality changes , depression and his favorite , feeling unwell .