I can only advise from a pilot, not a medical perspective. Having failed a Class 1 initial, I think you would be extremely unwise to put any money at all into professional pilot training unless you find some specialist medical expertise to alleviate the problem, and with some long-term assurance.
I think you will find that CAA will keep your records, so you will not be able to go for another attempt without their knowing what has happened up to now, so they will look at you very closely.
Probably not what you want to hear, but that's my view. Others might see it differently?
But, good luck.