Became disabled and unable to work but still pursuing diagnosis. What are my options?

I have been gone from my job since mid March but have used up all my annual paid sick leave so I am now on “excused unpaid leave.” I have developed disabling neurological symptoms, cognitive decline, and pain but doctors are still looking for answers because all of my testing so far has come back “clear” except one of my MRIs. My cognition is so bad that I struggle to recall basic things like what I ate for breakfast this morning, or recalling what I did the day prior. There’s just no way I can return to work like this, but my job only excused my leave until the end of April essentially.

From my understanding, without a diagnosis, I can’t pursue shobyoteate or anything of the sort. Doctors have also told me they can’t prescribe me medication to help me manage my symptoms without a diagnosis. This is all made even more complicated by the fact that I was (am?) still in my probation period at this job. I’m on a humanities visa and recently renewed for 5 years this January.

What are my options? Is there disability support in Japan?

by animalsnotppl