Hi Liyyamurr,
Waldinger himself has stopped using desensitization injections and have stopped using skin prick tests for POIS diagnostic, and also have confirmed that a have updated his view and he know sees that POIS is more complex than a simple allergy, so it cannot be diagnose and treated like an allergy, with skin prick tests and desens. Auto-immune disorder are treated by blocking the antigen, or the pro-inflammatory agents implied in the immune reactions ( cytokines and others), or by controlling inflammation in general, directly or with medication that calms down the immune system. Be sure that Waldinger is well aware of what you have shared, that is, that skin prick tests are postive or negative independent of having or not POIS symptoms, and that the limited experience up to date with desens didn't show much clear, consistent or neither convincing results. I think this is part of why, now, he search for an antigen and for cytokines involved, in order to fight POIS with this new approach.
The psychosomatic part of POIS may be different from one member to the other . For example, you say that finding the forum and reading about POIS made your symptoms worst. I can testify that, in my case, when I have found the forum, my symptoms didn't change, and eventually,the information I have found on the forum helped me get more efficient relief. So, it is not all white or all black. However, I think that managing emotional reactions and having well adjusted thoughts and beliefs is always important, be it in POIS or in any other health disorder, and in life in general. That is why meditation and yoga are an integrated part of my personal method for controlling my POIS symptoms.