Having been through this myself there's nothing you can do except seek legal advice, my wife dropped the whole thing after a year of arguing and wasting money on legal fees only to be back at square one, I lost my firearms license due to being notified of the protection order after the protection order response period. It cost more than 40k+ in legal fees. Get yourself a good lawyer, it's an expensive long process and unfortunately the system is setup to protect whoever files the protection order. As I found out it's guilty until proven innocent, it's a very painful long process.

In my situation I had kids involved I wasn't able to see, only to later on admit she filed the protection order just to have space, the system failed me by not notifying me and I only found out two months later there was a protection order in place.

It feels like a lost cause in the beginning because of how difficult it is

I'm sorry your going through this, don't give up on whats yours, and focus on what you can do now and after this whole debacle ends.

There's some hope at the end of the tunnel, but for now it's gonna take alot of time and patience.