Agree the the PPs that your anxiety is the issue, not your DS. And, yeah, it's offensive. It's one thing to have these worries after your DC has been assessed or after you get a diagnosis or while you are encountering real challenges. You're not.
If you really wanted answers to real concerns, you'd ask for a referral to a developmental specialist or you would enroll in one of the NIH studies on ASD/developmental delays like this one
https://clinicaltrials.gov/ct2/show/NCT00271622?term=autism+and+bethesda&recr=Open&rank=4 . They've been talked about extensively on this board as have recommendations for when there are real concerns. Yet, you don't seem to have found any of those threads. Help your DC by helping yourself.
Oh - and if you do go to one of the studies, stick with it. You need to make some sort of contribution to the SN community.