I've had inner ear issues since childhood and had tubes as well - I often get ear drum perforations (hole in ear drum from bad colds) which keeps me on the ground since I can't fly.

I'm able to pop my ears too and have been flying ok for over twenty years up to fourteen hours without issue. While flying I stay hydrated drinking on flights and make sure I have Claritin and a decongestant to ensure no fluid backup. I fly with Bose noise canceling earphones to listen to music while traveling.

I understand the anxiety but think you should be ok if your ENT has cleared you. I would try a small flight first before a long haul - good luck!