Speedhold,
I'll just add one bit to Fogrunner's comment about it being basically cut paste UK CAA and that is to note there are exceptions.
An ex colleague of mine came out here with a full JAA class one medical and was taking approved medication for a minor condition. The meds approved by JAA were not, however, approved by QCAA and long story short he is now back in Blighty.
If you have any health worries it is quite possible to arrange a QCAA medical in Qatar for yourself before quitting the current job but otherwise it is just one of those "risks" of coming out here to work with QR really.......
All the best,
Chinchilla