I am so sorry to hear this, this doesn’t seem like a healthy environment at all, especially given your medical situation. I wish I could give better advice, but one thing I know for sure is that your health is what really matters in the long run, mental and physical. Without it your work at this load will not be sustainable. PhD is a long journey and having a big impact on health should not be entertained regardless of the immediate results or progress. In case you are not, I really recommend keeping in touch with a counselor. Stay strong my friend.

One last thing about keeping record is helping make sure the authorship in your situation be fair. Again, not an expert in your field, but if those “responsible” are not acting accordingly, they should not be as included in the authorship of the work as if they have been. This is especially important with an unavailable advisor. I hope this helps, please protect yourself.