Asher K:
As I was falling it occurred to me that I was about to get stream entry and I couldn’t help but get so excited. I was pumped. There was nothing I could do. My heart started pounded. I cant remember ever feeling such overwhelming excitement.
I second the AP. When i had my first experiences of AP, I was seriously "overwhelmed with excitement" and my "heart was pounding". When I had my first and later experiences of the 11h nana, I was never overwhelmed nor had my heart pounding. The 11th nana had me super underwhlemed and my heart as calm as windless day. I did have a few "something is about to happen" episodes while in the 11th before 1st path occurred, but they were never overwhelming, just slightly anticipating.
Comparing with my own experience, I would second Jill's diagnosis of AP. Practice-wise? The answer would be to continue doing what you were doing in your practice, as sooner or later you will know for sure that it was the AP, with the dark night following it like thunder follows lightning. If not? if it was the 11th, you may notice back cycling through the DN re-observation territory or more calm panoramic 4th jhana-y-ness of the 11th. There is nothing more to do than continue to do what you were doing and lay down the speculating till it becomes clearer where you might be. It's all progress.
Next time you get the "anticipation" of something big, note the "anticipation" and "excitement" as "anticipation" and "excitement" or "pounding" if it arises. It is dis-identifying from and objectifying even that anticipation and excitement that gets you across the line.
My 2 cents.
Nick