Is Iron Supplement The Right Medicine For Nausea, Low Appetite And Brittle Nails?

I have had nausea and loose bowels for three days . Loss of appetite . I have noticed my nail beds look like they are curved down on the ends and are very white and the white extends back down into the bed of the nails in odd rounded out formations on most nails and the beds are more red than normal . I am anemic and aware of it . My doctor has put me on an iron supplement . No fever just very fatigued .