This isn't really a medical reply but I suggest you go along to a flying school and talk to a senior helicopter instructor.
The problem is not only getting approval from the CAA. You must be confident you can calculate fuel requirements, can read back and set numbers on controls and radios plus assess compass headings. I regret you may well pass the exam to get a license without any of this being properly assessed. You might only find out the hard way when you are solo.
It is in impossible to write down numbers or calculations so you must be assessed on what is unusual before you start paying
Best of luck