I am so sorry that you have experienced this and that there is suspicion of poisoning.
I am glad you are feeling better.
As you are aware, arsenic poisoning, if not exposed to it occupationally, is not usually suspected when presenting with gastrointestinal illnesses. It is often a long and drawn out process (repetitive hospitalizations with similar symptoms, etc) before it is often even thought of.
The crescent moon (if it looks like white lines going across the nails) are also known as Mee's lines. These can be a symptom of arsenic poisoning; however they are not specific for arsenic. They can be caused by many illnesses--pneumonia
, heart failure, carbon monoxide poisoning, thallium poisoning, sickle cell anemia, kidney failure are just some of the underlying causes.
Because you are potentially three months or more out from when you were possibly poisoned, testing is more difficult unless you continue to be exposed (if this is the case urine testing can be done). Hair and nail testing can be performed if the exposure is over--however these tests are not standardized and for this reason, are often not accurate.
If your levels were extremely high, this would be more helpful than low levels--most people will have some levels of arsenic in the hair and nails. You may be able to find a physician in your area that does hair testing (it has to be sent to a special lab in most cases) but again, be wary of the accuracy of the test unless your values are very, very high.
Hopefully, this will not recur for you. If you do have a recurrence of symptoms, the diagnosis is made by doing a urine arsenic level. Alert your doctors (or have a family member you can trust do so if you are too ill) that you suspect this may be going on so that the test can be done while you are ill.
Take good care of yourself and I hope that you are safe.
Please feel free to ask any follow up questions,
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