I have a 16 year old Severe TBI son in my home who has a very dark tea or cola colored urine output. His blood pressure has been high for the past two days. 132/84. normal bp is 120/60 for him. he takes propranolol, amantadine, sodium, fish oil, ranitidine, bromocriptine, and prevacid. His last hemoglobin came back low. 9.2 what might cause this?