Underweight with pcos

I’m a 20F and I have been diagnosed with lean pcos. I am facing hirsutism. I also have significant hair thinning and hair loss, and my hair volume has reduced a lot over time. I had acne around two years ago, but it has mostly improved now. My biggest struggle right now is that I am very underweight at 36 kg and 5’1,(BMI 15)and I am unable to gain weight.

My doctor previously suggested some pills and supplements (I don’t remember the names), but they didn’t work for me. I only took them for a couple of days because I had side effects, so I stopped.

I am trying to understand how to manage this naturally through diet or lifestyle changes that could help with my symptoms.
I would also like to know what tests or medical treatments I should consider and if anyone has had a similar experience and what helped them.

Any advice would be really appreciated.