How should I deal with people who hand out unsolicited advice?

I have an autoimmune disease and suffered since age two. People keep giving me suggestions and advice on how I should handle my illness, etc. But sadly none of their suggestions I've tried and were unsuccessful. My mom's hairdresser whom I never met, keeps giving me unsolicited advice. I was shopping for a car. I had my heart set on a Civic or a Corolla. The hairdresser told my Mom I'd be better off driving a Volvo because Hondas are cheaply made, unsafe and get stolen while the Volvo was built like a "tank". I'm not the "street racer" type and I keep my cars orginial and take good care of them. She did all she could to get me into a Volvo and laughed when she heard I wanted a Honda or Toyota.

This woman also tried to tell me to stop eating Mexican food because it had MSG in it. I have tricuspid regurgitation causing chest pain, etc. I stopped eating Mexican food because of her suggestion and it didn't improve anything with my heart. Just before my father and I took a trip to Japan, she told my Mom I should be "easy" on my father and I'm not very considerate. My father and I take plenty of breaks on trips I mean, I hate people who form opinions about me, especially if they've never even met me. I know people have good intentions when handing advice but I take it as a form of discrimination against people with disabilities.

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