No, as I've said many times, outside of this sentence there are no absolute statements.
And our understanding of reality changes, so that what was true at one time is not longer true ─ which is to say, truth is never absolute, but it is indeed retrospective. For example, as you know, the Michelson-Morley experiment put an end to the understanding that light propagated in the lumeniferous ether. Or, going the other way, until 2012 it wasn't true that mass is due to the Higgs boson, but now it is.
My definition of truth is that truth is a quality of statements, and a statement is true to the extent that it accurately reflects / corresponds with objective reality.
What definition of truth do you use?
No, self-awareness is not illusory. You, looking out through your eyes, and via your other senses, perceive the world external to your self, accurately or inaccurately, but you can still cross the road safely, still recognize your parents, siblings, friends and others, still understand that you / your body needs air, water, food, society and so on.
I don't suggest that we do. On the contrary, I point out that we each perceive the world we live in through our senses, aided of course by our evolved instincts.
No. You will never be someone else, or a bird, or a car, or a gutter, or a shop, and nor will I. Your death will not be my death, or vice versa, in any meaningful sense.
And when you die, that will be the end of you, and when I die that will be the end of me ─ no more perceiving, no more living identity for either of us. But reality will still be there.