I dunno where you heard native cultures didn't have mental illness... It's goes throughout history, from famous dictators, to historic medical documentation. Depression was called Melanchalia in ancient Greek and Roman times. Mental illness just used to be considered a spiritual problem instead of a physical one. There is no utopian past times where people felt right all the time... I dunno if YOU find that comforting, but I kind of do.
I wish I could find a pdoc that would treat me for major depression. I don't mind the mania, myself. I just don't like the lows. But... it only takes a few interactions before they figure out I'm bipolar, and then all antidepressants are off the table, we have to rehash everything I've already taken, they start suggesting Lithium and a myriad of antipsychotic medicines, and I end up walking away because I'm done taking sedative medicine. I veto. I refuse.
So... maybe just try it? Put your fam on alert to watch your behavior. If you get dodgy, you can stop taking it and inform the doc, and tell them you're not gonna take it. At the end of the day YOU are in charge of your treatment. They can't MAKE you take anything. They can refuse to treat you with certain things, but eventually you guys should find a middle ground. If your pdoc doesn't listen to your concerns... you need a new pdoc.