Hello Xena,
I would see a Cardiologist to ease my mind. If you don't have access to one through insurance, then yes I would use the ER as a means of being evaluated. It sounds to me like with your symptoms of lightheadedness, tightness following the skipped beat and pressure in your throat, you may be experiencing PVCs or preventricular contractions. PVCs are beats of the heart that can be benign in most folks but can causes problems for some. Considering your family history (which is very important here) and symptoms, I think you're more than justified to be seen by a professional for a true clinical evaluation. I would write down a short list of symptoms and concerns to take with you. Walking into an ER is so intimidating and it's easy to blank out when giving your information.
I hope you feel better soon and wish you the best. Take care.
Marell