EC Process work does not often start with a clear understanding of the internal energetics, such as you are describing. It's good that you have zeroed in on the solar plexus - that's a good start. What you need to do now is to continue or develop a right-brain inner practice where you sit with the energies or the resistance and allow it to develop. It's ok to accept resistance - true acceptance of resistance often leads to a breakthrough, which is what you need. Our starting assumption is that there is suppressed, unconscious energetic congestion in the solar plexus - the significance center. The unconscious resistance you apply to those feeling energies carries over into your activities, leading to the ups and downs you describe. We would expect to find suppressed feelings relating to significance, not being good enough, disrespected, a failure, etc.
I just re-read a few months ago 'In Search of the Miraculous.' I'm a big Gurdjieff fan, but I'm not familiar with his work thing. What I got out of it was to strive to maintain constant self-remembering, or witnessing. This ties right into EC work, except we go deeper into feelings than he did.
Of course, work can be an escape, or become an addiction, or it can be taken to a Karma Yoga level, which is doing the work without thought of reward or personal benefit.