My mom's health anxiety is driving me insane

To preface, my mom (54F) has always had pretty bad health, and what I would consider to be quite severe health anxiety. Pretty much since menopause, she's been in and out of doctor's offices for one reason or another. Sometimes they do find something wrong, other times she gets a clean bill of health.

Now, this is all fine and dandy, except for the fact that she projects her health anxiety onto me (23NB). I know this is quite common among parents to have, but she really takes it to the extreme. Ever since I was 17 and diagnosed with hypothyroidism, which runs in my mom's side of the family, she's been convinced that I'm some kind of frail, sickly child. She constantly checked my body for anything out of the ordinary, whenever she wasn't busy worrying about her own health issues. It got better when I was in university and moved back to Canada because of it, but even then, I haven't been able to mitigate the effect of her anxiety on me.

Things noticeably got worse last year, when I had to go and get something checked for my liver. It wasn't a big deal, the doctors said we'd get some tests done and if something serious is found, we'd deal with it. I tried my best to hide this from my mom, but she found out when we were rooting through my medical documents for a summer job at a hospital. That's when she flipped her lid when she realized I was undergoing such procedures, and she immediately started assuming the worse, and kept pestering me day in and day out to push for more and more diagnostic procedures. And whenever I would argue against her, my dad would side with her, and essentially I would have to agree and get them done just to shut them up - and they would constantly call to follow up and demand results. If I declined, I'm pretty sure they would've booked me a plane ticket to their place in the US and drag me to the doctor's office and get them done there under their insurance.

Then, my mom thought that my moles and freckles looked funny, and dragged me to a dermatologist to get them checked out, even though I look at them day in and day out and none of them have changed in the slightest. I did try to tell her they were fine and this was unnecessary, but I ended up giving in because she just would not stop touching them and worrying.

Fast forward to now, where my mom has been undergoing procedures to diagnose autoimmune conditions, and she noticed that there was something on my leg that again, she thought looked funny and immediately jumped to conclusions that it was a sign of something major while visiting for my graduation ceremony. Again, she would not stop touching and examining my leg, even when we were out in public getting dinner. And now, she's been pressuring me to get a whole slew of bloodwork done, and a referral to a rheumatologist because she's basically convinced that I have some sort of condition, when I'm pretty sure it's something minor, and even if it is an autoimmune condition, I have zero symptoms otherwise and all of this testing is just unnecessary suffering on my end. But no, I have to give in and agree to their demands for testing, because if I don't get it done here and give them the results of the tests for their peace of mind, they'll just drag me elsewhere and get it done anyway. And I have no ability to decline, because my opinion isn't valued in this household.

Really, I feel like I have no control over my own medical care. I don't want them to worry about my conditions, both current and future ones, I am fully capable of handling the diagnostic process myself with doctors. But my mom is wholly convinced I am unable to advocate for my own healthcare, because all my live she's been making such decisions for me, and she seems to be unable to relinquish such control, combined with her own anxious tendencies. I feel less like a person, and more like a doll for my mom to play doctor with. But given such a history, and how my dad always sides with my mom, how do I tell them to get their noses out of my healthcare???

Tldr: Mom has severe health anxiety, and projects it onto me. How do I tell her that my healthcare is my own business, and to stop obsessively worrying about me and forcing me to get unnecessary procedures done.