Many people with HIV have a high MCV caused by HIV medications. This is not dangerous. The MCH is calculated by dividing total hemoglobin by the total number of red blood cells. If you don't have enough platelets, you might get internal bleeding or you could bruise easily. Taking HIV medications usually corrects this problem.
Platelets are almost never high enough to cause health problems.
A high WBC usually means that the body is fighting an infection. A very low WBC can be caused by problems with the bone marrow. This condition, called cytopenia or leukopenia, means that your body is less able to fight off infections. If you have a very low count, you could get a bacterial infection. This condition is called neutropenia.