"Scromboid follows ingestion of fish that have been inadequately refrigerated allowing the build-up of high levels of histamine in their flesh; histamine accounts for the symptoms of scromboid."
Upset stomach from scallops and sole?
Maybe look for a new fishmonger, or better refrigeration
, or more careful restaurants.
*Constant worry that the methyl mercury levels are high
Worry isn't really being sick from eating fish.
I have met a couple of folks who contracted ciguatera it is very serious be careful of fish prone to carry it. The locals in areas where it occurs can give advice on that matter.
I live in South Louisiana in spite of the drilling disaster and all the chemicals dumped into the Gulf off the coast for a year the fishing
has been great this season. Good in quality and quantity, finfish, crab and shrimp included. Federal and state agencies are constantly monitoring the catches for contamianats and have given their OK so far.