I have been having some of the same symptoms. All tests came back normal too. VERY frustrating. Went to see a Psysiatrist (Pain Doctor) who diagnosis was a strain in my Xyphoid Process. Just had a cortisone injection on Monday, but not sure it is going to help. If it doesn't relieve the symptoms I received information from a friend (nurse) who spoke with someone with the same symptoms that has done botox injections and said it helped.
Like you, frustrated! It completely interferes with my daily life, exercise, etc. I can't bend, can't stand for long and I've gained a great deal of weight.
On the brighter side, I just started the Slenderiix diet and I am loosing weight. Hoping that will also help. I'm sure the added weight over the past two years has not helped my health.