This happened to us in 1998. But it was because we were both diagnosed with (different) invisible chronic illnesses. Of an extended family of 26, exactly 4 stood by us. Unfortunately, none of them lived even remotely nearby.

As far as friends, every last one disappeared.

No one could cope with someone with chronic illness.

Our few friends now are all people with chronic illness.

It was really hard the first few years, but we managed to survive without a physical support system, and now, 20 years later, we just live our life as we choose.