I have a master's degree, Myriam and quite sadly....
I feel it was a waste of time and money ;o(

Most of the companies do not even ask for that level of education (unless you are a doctor... I hope!)
and the ones that do - list it as 'desirable' only.

If you have bachelor's degree with lots of experience - this will take you as far as you want in most of the countries

Plus... it seems that in Qatar you get paid for your nationality, not academic qualifications anyways...