I turn on Proxy and got 520 after DDoS attack

Hi Cloudflare community, I got DDoS attack reach to 520 and prevent it immediately in my host. My hosting was working good after 20 minutes but my website still 520, I don’t know how to solve because my host worked stable. I think about cloudflare issue and come to cloudflare and turn off proxy of my domain then it worked and my website work fine again.
In the next day, i turn on proxy of my domain and 520 appear immediately. I don’t know why, please help me.
I finding answers on cloudflare community but can not find the solution.
Thanks.

Hello,

Here are some root causes of 520 errors. This means your origin responded to us with a unexpected result.

Below are some items that are some common causes of 520 errors.

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