Have you trail ridden him again? Or at least, has someone else rode him on the trail? I'd hate to think that he is thinking he's won the battle. Be a turd on the trail = getting out of work.
Is there anyone at the stable where you bought him that can come out and work with you and him some more? I know personally, when the day comes I bring a horse home, I'm going to want a trainer coming to my place just making sure I'm doing everything right and not actually teaching my horse bad habits.
How old are you? If you search, you'll see a similar post from me a couple months back. I just turned 40. There is that distinct awareness the older we get that we CAN get hurt. Someone's got to pay the bills. We aren't kids and there isn't going to be anyone nursing us back to health all the while taking care of our responsibilities like when we were kids.
I was actually thinking of giving up riding! That lasted for like a day, lol. Then I realized that my fears and apprehension weren't a bad thing. They were the responsible thing. It's the grown up thing to do.
I can only speak personally, but I also switched back to western from english. I feel more secure and ride better in a western saddle. I also asked my trainer to not give me a tall horse. 15.2 is my limit. I don't care how sweet this horse is. Find me a short and sweet horse. The height of the big horses was also playing on my fear. Sure I can get hurt on a shorter horse. But I feel better being closer to the ground.
Not saying this is what you need to do. But my point is, for me, sitting down and re-evaluating what exactly my fears were and taking steps to make them better keeps me riding. I don't push myself.
I believe in working just outside of your comfort zone in order to achieve progress. And I mean JUST outside the zone. Not way the heck outside the zone to the point that you are shaky. This is supposed to be fun!
Really think about what it is that is scaring you. If it's just horses in general, then take a short break from riding. Just do ground work. If this Perch is scaring you, then ask that stable if you could trade him for something else. No shame in that. This horse is 5. You can't spend the next 20 years being scared of your own horse.
I think before selling him, you should 1) give it a few days and see if that fear wears off. It did for me. 2)try working with a good trainer. I'm all about getting that 3rd party in there. Don't tackle this alone!
Best of luck and keep us updated!