Worried about girlfriend self-medicating with meds from the internet

I recently discovered that my girlfriend has been buying psychiatric medications off the internet to self-medicate.
She buys things like various antidepressants and some benzos.

When I confronted her about this, I asked her to give them to me so I could throw them away. She started crying and kicked me out the flat for a few hours. When she let me back in, she said she has hidden all the medications where I will never find them.
I tried to ask her to see a GP so they can give her the medications safely instead, and she said no because she's been before and they refused to prescribe her the medications she wanted.

She is quite mentally unstable, probably even more since she started these meds. She said she doesn't care that they're addictive because most people are addicted to alchohol or cigarettes. She said she can't go in to work without taking a benzo.

I am worried that this will lead to her buying worse drugs off the internet. Or am I overreacting? What should I do?
We are both in our 20s by the way.

follow your instincts it's always right maybe speak to a gp yourself for advice and seek some advice but do whatever you feel is right.

Benzos are serious man. Did you see what happened to Jordan Peterson 😧

Oh really? I didn't know GPs could do this, as in give advice for a patient who is not there with you. What do you think a GP would say/advise?