Be your own guru
How did you arrive at 'you don't like me'? Of course, our views may be different, perhaps my views do not rhyme with views of any other Hindu, but so what? Should I have problems with all of them, even with my theist family.And that's me... Sorry, you don't like Me/you right?? So, it is Brahman. It cannot be said exists or not, so cannot be said Eternal or Temporary, cannot be said Changing or Changeless, as cannot be said exists or not - so cannot be said exists in form or formless..
As for existence and non-existence, perhaps these are phases of Brahman. A line of Nasadiya Sukta always remain in my mind. It says:
सतो बन्धुमसति निरविन्दन हर्दि परतीष्याकवयो मनीषा ll (poor rendering in Devanagari)
sato bandhumasati niravindan hṛdi pratīṣyākavayo manīṣā ll
Sages who searched with their heart's thought discovered the existent's kinship in the non-existent.
Rig Veda: Rig-Veda, Book 10: HYMN CXXIX. Creation.
Science is researching this point with various theories of Quantum Mechanics. A the moment they do not have anything definite to say about that. Can there be a complete void even without force fields, and can this void can come back into existence? I have always maintained that this question may be answered only in future and not in my life-time. I am content with that. I do not go into hyperbole and make false scenarios. I go with the current position, i.e., existence. If the future generations come across non-existence phase, they will need to incorporate it in their belief.