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I'm a bit anemic.
Literal
Anemia-ish [polite-copula-です].
気味 (ぎみ) is a useful suffix meaning 'a touch of, slightly tending toward.' 貧血気味 means 'slightly anemic.' This pattern is common for mild symptoms: 風邪気味 (a bit cold-ish), 太り気味 (getting a bit fat). Very natural for a doctor's visit.