I am afraid you cant just rock into Qatar if youve been here before - irrespective of how you left the country - you now need an NOC from your last employer in the country to give you permission to re-enter regardless of the reason - be it tourism or otherwise. I recently had to grant an NOC for one of our former employees who now works in Oman but his wife remains in Qatar working under company sponsorship for him to come back and visit his wife - given that restriction, youve got NO chance!!