DVLA Treadmill Test

hi has anyone been in a similar situation i had a heart attack 4 years ago and then found out I was type 2 diabetic all tablet controlled
had my first test over 3 years ago and passed no problems.
i just had to have my 3 year test and failed on the treadmill after 7 and half minutes legs give a way was told not to worry as there is a bike test which I had 2 weeks ago and failed after 8 minutes its harder than the treadmill test.
i just phoned the dvla and been told they not review my report and would get back to me to see what action or options there is has anyone been in this situation, at present i am on a section 88 since February as my licence ran out then.
Sorry for the long post

im Type. 2 , controlled by tablets & it has had no effect up till now on my lisense .