There seems to be two issues running here.
One concerns omitting information on a medical application. The second concerns not accepting or liking the results of a medical examination and as result going forum shopping until you get the result you want.
If you omit relevant information you should correct it at the earliest opportunity. Of course you cannot omit something you did not reasonably know at the time, however if you did withold relevant information you can expect undesirable consequences as a result.
If you are denied a medical and then decide to go shopping in another forum to obtain a different result, you cannot really expect the initial authority to simply say "that's fine" and accept the new result, where they have already raised a concern or made a stipulation.
To suggest that any medical deficiency is best judged by the individual themselves as to whether they are "safe" or not is simply inaccurate and irrelevant. An attempt to bypass the criteria set down by a state is probably naive and certainly a risky venture if the applicant ever intends having to make a subsequent application to that state.
I wish you well in your endeavour, and hope you are successful in resolving these difficulties, however I do feel you have been the architect of your own misfortune here and believed what you wanted to believe in order to suit your own situation.