Namaskar Yogis

Hi, I am suffering from PCOD, I have a hectic schedule with office work, 6 months back I started yoga with a home trainer , I have no change in my body. Honestly, I get bad cervical after doing yoga practice. I think I am losing interest & faith in yoga . 
Any suggestion where I am going wrong .. I really want to bring that enthusiasm but no idea ..

Hello, there is so much chaos with Covid-19 around,  I am a pregnant female and I want to do chanting. Can anyone suggest me some good chants?

Hello,
I am a beginner meditation practitioner and currently facing some issues while sitting for a duration longer than around 15~ mins. When I sit for longer, I either face pain in my back/spine or legs, or my legs go numb. Someone suggested that certain yoga asanas or methods can help with sitting posture in meditation and enhance the body's ability to maintain stillness and stability for a longer duration. 
What would be your take on that? Please offer some suggestions which might help me with my meditation practice.

Dear, I am 60 years old. I have knee pain, can yoga help me. My mother got her knee operation ten years back but her pain has never reduced. Can anyone suggest me, how Yoga can help me?

Cheers 

Asha

I want to know Yoga & psychotropic substances - is it valid or invalid? however, in our religious texts lord Shiva is witnessed taking it and if yoga is following his path so does it validate to have psychotropic substances? Whenever I am hiking up in the mountains I see so many yoga practitioners consuming it but I want to understand that is it right or wrong? as it confuses me.