I try to do Frenzel as I prefer that. But when it comes to equalising once I'm in the water and inverted, thats when it gets hard for me to equalise properly. I think on the first 2 dives I was rushing it and not equalising on the surface properly. The 3rd dive I took my time and eqaulised before my duck dive and tried to keep it going all the way down. I think it was the first dive that hurt it.
I can equalise in both ears still - hopefully this is a good sign.
Are you sure you are doing Frenzel? I am asking because of your previous question on how much pressure to use at depth.
Do you remember at which depth you felt the pain? Was it around 6-7m?