First of all, I will send you prayers and positive energy.
Ok, second, and a close second at that, I'd DEMAND from your doctor that he be completely forthcoming with you about what you may - or may not - be dealing with. You absolutely have that right to know. If you are submitting to testing, you have a right to know what you are being tested for. I would demand that information from your doctor, like, YESTERDAY. It is not for him to decide whether to cause you worry or not. I'd say that you have plenty to be concerned about and keeping this one 'secret' isn't helping matters. You need the cards on the table. Period. NOW.
You need to have the option of discussing any potential issues with a genetic counselor, so you can better understand what you are facing, whether it materializes or not.
I don't have any experience with the issues you are describing, but you can bet your bottom dollar that if I was facing the issues you are, I'd make sure my doctor was COMPLETLEY TRANSPARENT about EVERYTHING.
I opted not to have any of the screens done. I just didn't want to worry about anything that I couldn't change in the end. I know that's not the right choice for everyone, and I respect everyone's choice to have or decline the testing...
Best wishes to you... as I said, sending you strength, wisdom, and prayer!