What does low MCV 74 low MCH 23.7 high RDW 16.6 mean? Everything else normal. CMP, LDH, CBC- freaking out! Can this be Vitamin Deficiency?

Iron deficiency. All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, what you provided suggests iron deficiency. Consult the doctor who ordered the tests. You may take oral iron and multivitamin supplements.