Really sorry for the long delay. Yes I have been unwell, unfortunately still not great but better than I was. Well enough to write a reply now though :)
1) Is there a separate entity 'self', 'me' 'I', at all, anywhere, in any way, shape or form? Was there ever?
No there is only what is experienced now, the rest are all stories. Stories in the from the past, present or future.
2) Explain in detail what the illusion of separate self is, when it starts and how it works from your own experience. Describe it fully as you see it now.
The illusion of separate self is the thought that another thought exists in a real form. Real in this case being something that needs to be dealt with or reacted to by further thoughts. This thought that another thought is real then creates a cascade of further thoughts. This seems to be something created by socialisation / growing up. An idea of self is given by our environment which we then treat as real. So the self is really a network of interdependent thoughts. But the keystone is the first thought - that the self is real.
3) How does it feel to see this? What is the difference from before you started this dialogue? Please report from the past few days.
Honestly, it feels no different. That was "my" greatest fear. But that's just an emotion triggered from that cascade of thoughts. There is nothing else. Had quite a few days to process this since you asked this question and can't detect any difference.
4) What was the last bit that pushed you over, made you look?
This is not answerable - at least nothing comes to mind. Am "I" over? Unknown! :D Maybe not. Maybe "I" can never be over. I cannot see I because there is nothing seeing and nothing to see.
5) Describe decision, intention, free will, choice and control. What makes things happen? How does it work? What are you responsible for? Give examples from experience.
Decision - A decision requires an I. I is that which is making a decision. Without an I there is no decision.
Intention - Again an intention requires an I. Something has to have an intention. There can be no intention without a subject.
Free will - And again, free will requires a subject. If there is nothing to be free and there is nothing to have a will then freewill is not a meaningful concept.
Choice - Something has to choose. Without I there is nothing to do the choosing.
Control - Something has to be in control. There needs to be a subject for control to have any meaning. Without the I then control is null.
What makes things happen - Nothing makes things happen. Things happen and thoughts arise about those things.
"I" can make itself responsible for anything or nothing. Responsibility is a thought that relates the the thought of I. So again its all really the same as above. Ultimately with no I thoughts of responsibility are just that - thoughts. They may be there or not. But that's it.
Am I responsible for pressing these keys? The body is pressing keys. The is an idea of I. There is an idea of responsibility. Are they all linked? No. They can be linked. Or they can be left unlinked.
Going to leave 6) for now - will consider that one tomorrow :)