Why would the law guardian hate you? What does your own lawyer say about this???
I think I would have filed the report. I don't know much about CPS, and maybe some others have bad stories...but what else are you supposed to do? And maybe they can help you!
When your ex called the police on you, what did they do/say? Could they actually arrest you? I wouldn't think so. Maybe it's good you're going to court, good it's being brought to a judge's attention. Don't be afraid. You've probably heard so much crap from your ex that things have become a little muddy - but YOU ARE RIGHT about these things regarding your child. His medical care...his vision! Your ex has been doing his best to scare you into thinking that he might have a good case against you. But he's crazy. I mean, what is this stuff about, "You will not do this...or that..." I hope the judge tells him to take a flying leap.
I think, in court, while it's important to keep yourself respectful, etc, that you have every right to be confident in stating your case. You get your child medical care - your ex does everything he can to obstruct that care. You don't have to be apologetic or make excuses. This is your child's health! Your ex clearly doesn't care about your child, but he very much cares about controlling you - with the thing dearest to your heart, your child's health. That is as low as a person can go, and I hope a judge sets him straight.
And do think about filing that report. I think you have very valid reasons. And if he files something on YOU in return...what is he going to say? "She gives our child prescribed medicine."
Plus, I'm sure CPS has seen it a million times - that a parent will retaliate on the other parent for filing a report. Anyway, I hope your lawyer can advise you too. But you really are right not to let this go!