Well - to answer the last question first this patient needs treating as high-risk chest pain - that is MONA, clopidogrel, LMWH and consideration of beta blockers.

As for the ECG the answer is to ensure that the leads are placed with true reflection around a vertical axis. Thus the arm leads are reversed, the leg leads are reversed and the V leads are placed so that V1 is on the LEFT side of the chest at 4ICS. V2 on the RIGHT at 4ICS etc. So the last ECG is the correct one.

A number of case reports of AMI in dextrocardia have been published. Have a look at the one below:

AMI in dextrocardia report