Loss of motivation to do either academia or industry. Wasting days and feeling lost. Any advice?
Sounds like burn out. Take a vacation. Do something fun and not work.

These sorts of feelings are pretty common for someone completing an advanced degree. But in most cases the feeling doesn't last unless you continue to add stress. 

In many cases it is worth seeing a counselor. 

But your current activities are probably too related to work to allow for stress reduction.