How would you react as a parent/friend?

I have been struggling with some disordered behaviours for 3.5 years but it's something I don't usually disclose to the people around me.
My parents have noticed that I haven't been doing great the past couple of months, so I told that as much as I deemed necessary. Meaning they know I'm struggling with extreme perfectionism which is making me feel depressed and that I'm seeing a therapist because of it.
What my parents don't know that is that I've been making myself throw up for years. It's not technically an eating disorder, psychiatrist classified it as impulse control disorder. Whenever I get stressed out, feel unhappy with myself or get upset, I throw up.
I don't technically want to tell anyone but sometimes I think maybe I should because I'm so tired of hiding. Everyone thinks I am this confident person with the perfect life, yet here I am, making myself throw up on purpose because I don't know how else to express my feelings.
I've been on medication for a short while now and it seems to be helping but literally every time I think I might be over it I end up purging again shortly afterwards.
It's a far bigger part of my life than it should be. And what's worrying me the most is that I think it's the kind of thing that completely changes the way you view someone. Like if I told my parents or friends they would view me in a completely different light and things would never be the same again.
Am I exaggerating? If someone you cared about and who you thought was mentally healthy and happy would confess something like this to you - how would you react?

Dear Maksim,

I'm so sorry you are in this situation. Wish I had some useful advice to offer you but sadly I don't.

My experience, which is very limited and cannot be generalized, is that people in my life who are not afflicted with mental illness never seem to arrive at a deep experience of how it affects those who are so afflicted.

And without that deep experience; real understanding and empathy are almost impossible to achieve. And it seems that without such understanding and empathy, it is difficult for those not afflicted to offer really heartfelt encouragement and consolation.

But like I said at the beginning, my experience is painfully limited and therefore perhaps in error.

The desire for honesty can sometimes come into conflict with the desire to be accepted, respected and loved. There are costs and benefits to honesty and costs and benefits to the need to be accepted, respected and loved.

Each person at each stage of life has, perhaps different needs and priorities regarding these sometimes conflicting desires.

I have often regretted caring too much about what people think about me but have also had regrets about concealing who I really am from people close to me.

And the situation is an ongoing one. I face decisions about these things all the time, so my heart really goes out to you.

Hopefully many others here in similar situations will see your post and respond to it with more helpful words than my poor words.

I wish I knew what to say to ease you distress and pain. It is really heartbreaking what you are going through. I also hope that your therapist will be able to really help.

Sincerely yours, Yao Wen