I understand how you feel. Last year on our way out of town for a 500 mile round trip vacation, the warning light came on for coolant. We have a 2010 F350. We were stopped for gas when this came on so they directed us to the Ford dealership 5 miles away. We got there, the technician came out, said it was a standard warning but tested our coolant level anyway. Turned out it was fine. He reset the warning message and wouldn't charge us. We were on our way. A little off schedule but with peace of mind. They will find a reason for the check engine. Keep us posted on what they find. If nothing else, postpone your trip till this is taken care of.