I eat a lot of fish my mouth tastes like metal should i be concerned about mercury or iron overload i eat a lot of fish and leafy greens ?

Not from the metal: Heavy metal poisoning would affect more than your taste. Wonder if you may have iron deficiency since your diet contains little or no iron.

Concern re: mercury: Iron overload seems unlikely though leafy greens are a good source of iron. Some fish have high levels of mercury and some have low levels. See my link- If you eat a lot of the types of fish rich in mercury you could have mercury toxicity. Blood tests can show recent exposures though an integrative Dr. can do a chelation challenge test too. See https://tinyurl.com/y2em8lhl

See below: It is unlikely that you have mercury or iron overload/poisoning. You may visit this site for information on mercury and fish. https://www.fda.gov/food/metals/what-you-need-know-about-mercury-fish-and-shellfish