Once, I nearly abatained from communion as I had a violent stomach flu for weeks, and in fact had just vomitted outside the church, on my way to the restroom, part way during the liturgy.
However, I was feeling so poorly that I did communicate, and instantly upon receiving the Body of our Lord, the nausea was gone, completely, and all the pain in my abdomen with it. I was able to eat normally again, and all symtpoms stopped completely. This was on Pascha in 2014.
That said, if I were seasick or casually nauseated and not very ill I would not partake. But in that special case, Im glad I did, because the Eucharist did actually cure me. Completely.