Trial flying lesson

Hi

Due to a freak chance meeting with a pilot in training and an aircraft
engineer, I have managed to talk myself into taking a trial flying
lesson.

Can you help with a few questions I have, having never been up in a
small aircraft and being scared of heights (well on tall buildings
anyway) But I do WANT to do this, don't get me wrong.

Can you experience pressure problems in your ears similar to on a
commercial jet?

Is it best to go alone with just the instructor, or take a willing
victim to witness your trial?

Do they have sick bags?

Do you get a parachute in case anything goes wrong?

And how addictive is flying really, I mean if I open my eyes and like
it?

All other helpful information appreciated, this is not a troll, I'm
serious.

Many thanks