Sudden HARD irregular heart beats? Help!?

I am a 32 year old happily married mother of 5. I had a history of panic disorder after my 2nd daughter was born stemming from postpartum depression/psychosis. It resolved after a year, meds, and some therapy. I am typically a nervous person and I have palpitations or skipped beats that are very minor, feel like little flip flops of my heart and are just stress related. For the last couple days, last night being the worst, I had an episode like this: I was just sitting down at my Grandmother's deciding on dinner and a felt a huge thump in the middle upper portion of my chest like someone had kicked me there. It was obviously heart related, because it resembled a palpitation-only MUCH harder and stronger. I took some deep breathes, but it left some residual pain. Not the type you have from a heart attack-just nagging skeletal pain. I remained a little lightheaded and kinda shaky feeling but that was because it scared the begeesus out of me. An hour os so later, I felt another one, about half as strong. I took my benadryl for rest when I got home and feel asleep with no problem. I got up this morning to nurse the baby, and laid back down when I was finished. I then felt what seemed to be a few of the little flutters in a row in my heart that kinda took my breath for a few seconds. Again, obviously this has scared me to the point of asking for advice. This doesn't resemble the panic attacks I used to have. Anyone have anything similar and what was it or any advice for me? Thank you all, and God Bless you!~Taunya