Mother making me feel crappy during pregnancy?

My mother is driving me insane. I'm almost 11 weeks pregnant, and she feels the need to compare every single thing about my pregnancy to her own. First, she declared I wasn't allowed to buy anything and was stupid if I did because it would most likely result in a miscarriage, as 2 of hers did. Then, she asked me how my doctor's appointment was, and when I said the Pap smear I had gotten had really, really hurt (I've never had one before that and I've heard some people say it's less painful than others will say,, so I guess everyone's different but I was in tremendous pain) she went on this big rant, laughing at me, saying "wait until you get hemorrhoids." Then she proceeded to say I wasn't normal because I had bled quite a bit after my Pap smear, and she hadn't. I told her I was used to having horrendous period cramps (terrible, almost dying, throwing up, not being able to move type of pain, fever, chills), and that's something she's never experienced, and she told me I was just overly sensitive and too much of a baby because she NEVER got cramps. And finally, she asked me if I had morning sickness, and although I've only thrown up twice, I've been completely nauseous, especially at night, from the start of my pregnancy and she laughed AGAIN and told me that it wasn't REAL morning sickness and she had it worse than me and wasn't even able to take the bus.
I genuinely don't understand why she keeps asking me about these things just to put me down about them later. She's making me feel like I'm stupid and don't know anything about my own pregnancy. I've tried telling her to stop and she won't. What should I do? Had any of you experienced this?