I have a finished and seasoned 10yo gelding that I purchased the beginning of this year. His previous owner ran him on Chlorpromazine, but I was told it was more for her mind and he would probably be fine without it so I haven't been running him on it. He's naturally watchy and spooky, but it's getting out of hand at times. One run he will be solid and focused and win the 1D, the next he acts like he's never seen the pattern and is so lost because he's focused on everything but the pattern. He spooks in the warm up pen and will bolt if any horse passes him. He is very watchy when I ride him at home, but it's not near as bad compared to races. I'm not against running him on CP but I would like to try and get him over these things before I put him back on it. I've tried every calming supplement under the sun and none have made a difference. Would cruising him through time onlies for a few months until he calms down and becomes focused be best, or should I continue to enter and "season" him? Could he be like this since this is the first time he isn't being ran on CP? He's had a few months off due to COVID, so I want to bring him back to the races correctly. I've ruled out any lamenss or soreness, he's chiro'd and massaged regularily and has been cleared by a performance horse vet. Any suggestions and tips are appreciated! 

Have ever had him checked for uclers? How about being a bleeder? I have know of bleeders acting the way you have described, but they would bleed internal.. Just throwing some ideals at ya.. 

Yes, treated for uclers for 30 days and is now on a preventative and seems to be doing good. He is a bleeder and is ran on Lasix, so I don't think that's it. :/

Another possibility is noise reaction. I have a horse that was jumping out of his skin at everything - hated horses coming up behind him or towards him, would bolt across a pen and I finally figured out it usually happened when a loud noise occurred. I put ear plugs in and it was like having a different horse. This weekend I spaced out my ear plugs and was headed to the arena and he was spooking at everything. I couldn't figure it out and then realized I forgot - ran back to the trailer and put the ear plugs in and he was fine. 

That's something I never thought of! I'm going to order some now, thanks for the suggestion! 

Well sounds like you are on top of it.. Like another poster said maybe try earplugs

Tampons work great as earplugs, plus they're easy to remove via the string ;-) 

Used to have a gelding that hated loud noises. Did the trick! 

Lots of the ropers use the Tampons trick,

Im a big believer in running in ear plugs and running in a fly mask. The fly mask sounds crazy but for a spookie horse they work great. They shade the vision just enough for the horse to concentrate on their job and not the sparklie wiggles that scare them

From experience with this. When they have been trained and run on drugs. And you take them off. They do just what you described. 

It can take a long time to overcome this. And its a real shocker when they bring you the horse with anything in them and fail for some reason not to tell you that. And bong one day ol Pudden wakes up like a duck in a new world. 

If you're open to it, try a Hidez face mask for your horse. I've never personally used one, but know some people ride their nervous horses in them.