Now on the descent line I am separated from my buddy with an unknown diver between us and had to swim past him on the line to rejoin my buddy and our guide and may have caused an equalization problem with my right ear from over-pressuring.
It sounds like you were too anxious to get back to your buddy, maybe rushing to do so... Hence, neglecting your equalization. Never let something like that allow you to neglect your own safety. Never. It was probably stressed in class to stay with your buddy, but handle the separation calmly. This probably won't be the last time you become separated if you continue diving. All in all, some good small lessons on your trip. Nice of you to post on this board. Have fun, be safe.