As most people have mentioned, you will need to go back to "ground zero"....as if he/she is a foal with no human interaction. When I'm around a foal or any other animal that may be afraid of me...a Ferrel cat for instance, I just "be". I'll be around the animal in a pasture or whatever and read or do something quietly....maybe for an hour or so. I, personally, like to sing and use a sing songy voice when speaking to them. Eventually, he will get used to your presence and come to check you out. put your hand out, don't rush him into anything. The best way to have someone or something come to you when they are Leary is to back off, right? Retreat when they move back and eventually they will move forward again. If you are that frightened of him, you will, from this point need to get a trainer to train YOU with the horse and start with the basics...like leading, then lungeing (or round pen training), then grooming, etc.... I think saddling at this point is like putting a lion on his back....just don't do it.
I know from experience....I purchased a TB off the track as a 6 yr old. I was green, he was green. as you know "Green on Green makes Black and Blue". I got scared of him, I had to start from zero with a trainer. Once they get in your head, it's hard to shake it and once they get in your head they know it and will test you everytime.
I eventually broke my fear...but then became fearful again after a couple of spills. I didn't ride him for 5 years...last year my friesian was killed while we were on a trail ride. He slipped on an embankment, threw me, but as he tried to roll away from me, he broke his back and passed away naturally. At any rate, I realized had I not been a good rider, I'd be dead too. So, last spring I mounted that TB and he KNEW I had no fear....AFTER 5 YEARS we were a team again and we picked up right where we left off. I thought...there is nothing he could do that could outdo what Ben and I had been through. Today, I'm confident again.
I think YOU need confidence in your riding again. I'm sure you are a good rider....just get some confidence in yourself and your horse.
And always always always remember "Always trust your dog and Always trust your horse"...period.