According to Pathfinder rules on conditions: "If more than one condition affects a character, apply them all. If effects can't combine, apply the most severe effect."
Using this, is it safe to assume that someone that if someone was intimidated (Applying the "Shaken" condition) then immediately succumbed to a Doom spell, (Also applying the "Shaken Condition) is this person now "Panicked" until the intimidate wears off? What if someone casts Doom on someone twice? Are they "Panicked" as well?