As one of the TRE's that have recently left, I can assure it was not for medical reasons that I took the decision, but "medical" may well have become the reason if I had continued working as I was.
I left because I was fed up with continual "economies of truthfullness" and greed which have become the normal management style (in my opinion) at easyJet.
I can also say that many of my colleagues who left at or about the same time as me, told me they thought the same way.
As many have said over the years Easy should / could be one of the best flying jobs in Europe, but.... until there is a change in the management it can never be. Anybody considering going there should think very very carefully, I think.