"You said your chest was the sky at that time.  Yes! From the heart base that consciousness arises. I think I get a sense of how there is no longer any separation (between the sky and your chest). That consciousness radiates outwards from your heart base and extends unlimitedly.  Perhaps you are seeing your own love/bliss! In Buddhism, all these types of profound consciousnesses are said to arise and thus are of the nature to disband.  I can imagine having a conversation with my teacher if I had this experience and I suspect he would say that it falls into the shamatha/tranquility experiences.  This category of experience does not lead to nibanna. It gives peace and bliss which ultimately does not last as you said"

Let me elucidate a little more on this. In that case, when my chest was in the sky, I have a difficulty in stating if my subtle body was in the sky (akasha) or even if my subtle body even existed in that dimension. 

In that 21 points, I was describing cosmic conciouness using a combination of:

1. first-person account (described as a Core-self)
2. third-person narration (Objectivity, to give the properties of that place)
3. Dissolution of self (described as cosmic consciousness itself)
4. poetic/ aphorisms (to cover the abstractness)

Because there is no one style enough to explain it. And giving a common reference with respect to the physical or subtle body is also not enough to cover the experience.

I started with the physical body reference and went directly to dissolution or mergence. I skipped the subtle body stage because I don't think I experienced an astral projection of my subtle body in that dimension.

I can't even say I was floating or visiting in that dimension, subtle body or astral projection of subtle body just cannot exist there. All identities manufactured with contact with Prakriti (subtle & grass Material Nature) has to be dissolved to be in that dimension (that's how neti-neti works)

• I was "that" in "that" dimension.
• Conscious Existence was there.
• I was "that" and I was that "only" existence in "that" ever-expanding space.
• I am "that". 
• In "that" dimension, there can be "Only One" and you should be "that" or you just can't be "there"

It is an impersonal reality, only ever-expanding conscious space existed.

Sorry, this is the best way to explain that dimension accurately. It hardly gives any information than a bunch of "thats" but that's how it can be explained accurately. And that dimension is true, it can't be called fantasy.

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I started with a physical reference but the cosmic experience cannot be boxed within the chest area (both physical or subtle). It is a good physical reference to start with.

The chest area (Hrdaya) might have portals to more such high dimensions where no identities can exist including self. Also to places where celestial beings and Paramatmas exist.

Cosmic love was present in that dimension in a super subtle form but you don't really care about that when you are that in that dimension. The chest could be a portal thru which cosmic love can radiate or Comic love can also radiate thru multiple portals other than the chest or the space itself is enshrined with cosmic love like an invisible atmosphere. I did not research cosmic love as much, just observed it parallely. If I find something in the future, I will publish it.