Phenomenologically means to describe what happens when you practice with the details of what sensations, types of thoughts, ,emotions, moods, images etc were experienced. No speculation on what they might mean or this and that. Just plain phenomenological descriptions.
Your concentration and tranquility levels might need some beefing up. Have you practiced anapana meditation before? It will help calm the mind and result in an increase in joy, a good antidote for the dark night.
I recommend trying these instructions with an emphasis on breathing aware of the whole body.Try training the mind from the 1st part (contemplating the length of the breath), then work your way through each part shifting to what it says you should contemplate. Here contemplate means to recognise in experience and gently allow the mind´s attention to fall on those aspects continually. Directing your thought thus, you will train the mind in becoming tranquil and will relax those blind processes of mind and body which lead to dark night being so dark (ignorance of craving and clinging).
If you are up for it, dedictae 30 minutes or more to trying out at least observing the length of the breath as it comes in and out and tell me what you experience here in this thread.
"Now how is mindfulness of in-&-out breathing developed & pursued so as to be of great fruit, of great benefit?
"There is the case where a monk, having gone to the wilderness, to the shade of a tree, or to an empty building, sits down folding his legs crosswise, holding his body erect, and setting mindfulness to the fore. Always mindful, he breathes in; mindful he breathes out.
"Breathing in long, he discerns, 'I am breathing in long'; otthr breathing out long, he discerns, 'I am breathing out long.' Or breathing in short, he discerns, 'I am breathing in short'; or breathing out short, he discerns, 'I am breathing out short.' He trains himself, 'I will breathe in sensitive to the entire body.' He trains himself, 'I will breathe out sensitive to the entire body.' He trains himself, 'I will breathe in calming bodily fabrication.' He trains himself, 'I will breathe out calming bodily fabrication.'
He trains himself, 'I will breathe in sensitive to rapture.' He trains himself, 'I will breathe out sensitive to rapture.' He trains himself, 'I will breathe in sensitive to pleasure.' He trains himself, 'I will breathe out sensitive to pleasure.' He trains himself, 'I will breathe in sensitive to mental fabrication.' He trains himself, 'I will breathe out sensitive to mental fabrication.' He trains himself, 'I will breathe in calming mental fabrication.' He trains himself, 'I will breathe out calming mental fabrication.'
" He trains himself, 'I will breathe in sensitive to the mind.' He trains himself, 'I will breathe out sensitive to the mind.' He trains himself, 'I will breathe in satisfying the mind.' He trains himself, 'I will breathe out satisfying the mind.' He trains himself, 'I will breathe in steadying the mind.' He trains himself, 'I will breathe out steadying the mind.' He trains himself, 'I will breathe in releasing the mind.' He trains himself, 'I will breathe out releasing the mind.'
" He trains himself, 'I will breathe in focusing on inconstancy.' He trains himself, 'I will breathe out focusing on inconstancy.' He trains himself, 'I will breathe in focusing on dispassion [literally, fading].' He trains himself, 'I will breathe out focusing on dispassion.' He trains himself, 'I will breathe in focusing on cessation.' He trains himself, 'I will breathe out focusing on cessation.' He trains himself, 'I will breathe in focusing on relinquishment.' He trains himself, 'I will breathe out focusing on relinquishment.'
"This is how mindfulness of in-&-out breathing is developed & pursued so as to be of great fruit, of great benefit.