Now when I start to think about it, by childhoods disease (myasthenia gravis) could have been caused by radiation. Estonia was also afected by Chernobyl catasthrophe somewhat. I did a little reasearch on the internet and it seems pretty likely.
It is an autoimmune disease. I found and article where infants tyhmus gland were radiated on purpose, to stop it from enlargening - which was actually normal as much as i understandd, but the doctors didn't know it back then). These children had autoimmune diseases later. Also there was one article about Belarus and increased cases of myasthenia gravis in that area after Chernobyl.