You know, plenty of horse owners take those horses to a trainer for remedial/further training.
The problem many times, the horse doesn’t do any of those things with the trainer, because the trainer is riding proactively and has the horse going where it won’t think to do those things.
Some times, a trainer can get a horse further in it’s training so it won’t take advantage of less skilled riders.
Some times the trainer just knows the horse will go home, not be in serious training, maybe get too much to eat and is getting too fresh for the horse’s level of work/exercise, training and confidence and the ability of the owner to handle those fresh moments as they may happen and they may revert back to where they started, an insecure horse and tentative rider.
First, not knowing exactly what is going on there as far as what is going on, do you ride alone or in company, how the horse rides and how you ride, I would say, don’t go riding outside where you have a problem until you both are further along with your training and riding.
No need to practice doing the wrong thing, plus what is going on sounds like an accident may happen if this continues.
Second, the problem with stopping, spinning and bolting started way before you got to that point, the horse was already saying before it didn’t want to listen to you and do what you say and that is when you need to intervene.
To hear the horse when this starts and ride so that doesn’t happen, that takes time to learn.
The problems you find outside is reflecting the lack of training and skills you both have to be riding outside quite yet.
Could you find a good professional in your area that may evaluate both of you and then explain how you can learn to ride your horse so he is not taking those liberties with you?
There is so much that just can’t be learned from books or videos, you have to develop the skills with direct instruction, appropriate to the situation at hand, that may change every second.
Don’t get discouraged, sounds like this is but a bump in the road for both, the horse and you learning to work together.
That is part of how we keep learning about horses and riding.
All of us have been there at some time, with some horse and learned from it.
Learning to ride further, getting the horse trained a bit more, both are options that will make the problem you have now disappear on it’s own, once you both are more confident.
You will acquire the skills to prevent the horse even thinking of shying and the horse learns to go where told and that there is nothing to worry about.