Negative Merging
The symbiotic phase does not comprise only gratifying experiences;
it includes many painful and frustrating experiences. When the
infant's needs are not met adequately or immediately, he cannot
but experience frustration, rage and other painful affects. But
the infant's experience of this negativity is not experienced
as his own or his mother's; it is part of a merged relationship.
There is still no clear concept of self and other, and no clear
boundaries between the two. Thus the frustration and suffering
can only be experienced as what we call "negative merging,"
in contrast to the positive merging of the experiences of gratification.
(The Pearl Beyond Price, pg 245)

The positive merging is dominated by the presence of the Merging
Essence; its representation is an attempt to internalize it. On
the other hand, the negative merging is dominated by a primitive
affect of frustration. (The Pearl Beyond Price, pg 246)

Negative merging is undischarged frustration. And because the
frustration is undischarged we lose or fail to develop confidence.
This undischarged frustration is nothing but an undischarged blockage
on the physical level which reflects the loss of confidence on
the mental level. (Diamond Heart Book 2, pg 130)

Negative merging and conflict
Negative merging is a powerful force in the personality. It is
the core of suffering, the basis and the fuel of all emotional
conflicts, of all negative object relations. It is in the deepest
core of the unconscious, in the merged representations, manifesting
in the more superficial layers of the personality as the various
conflicts and distortions specific to the later stages of ego
development. (The Pearl Beyond Price, pg 249)

Negative-merging affect
When the need is not met, the heightened state of arousal and
tension remains, and the Merging Essence is not released. This
is clearly not healthy for the nervous system, for its function
of autonomic regulation is being impeded. This state of contraction,
which is the outcome of undischarged mounting tension in the nervous
system, is frustration, the primitive affect characterizing negative
merging. We call this affect "negative-merging affect,"
expressing its relationship to the state of negative merging,
but distinguishing it from the undifferentiated object relations
themselves, which are colored by the affect. This frustration,
this painful and primitive affect is felt as pure suffering. It
is the specific feeling of suffering. It is not just pain or anger
or fear; it is emotional suffering in its purest form. It is the
suffering at the core of all human pains. (The Pearl Beyond Price,
pg 255)

The presence of negative-merging affect in the personality manifests
as many kinds of desires. Since it is a state of painful undischarged
tension, the desires are ultimately for discharge, though the
objects of desire will vary greatly. And since only Being is a
Presence without negative-merging affect, then our ultimate desire
must be for realizing Being. (The Pearl Beyond Price, p 258)