Your sister is correct...you will not be able to work here with a scar on your lung. If you can get a medical permit from the Philippines, and later on the Health Ministry here found out about the scar after the xray, you can be banned from entering Qatar, more so if you came thru an agency, then that agency will be in biggggggg trouble.

Sorry, but that's reality. Try other country besides Qatar. You might find your luck somewhere else.