Firstly, I think it is awesome that you are undertaking an action orient regarding PRP, and I thank you for propelling our mostly stagnant conversation forward.
I think that it is still unknown to us why there is potential for HF loss, and if we could understand why, we could better make decisions for ourselves as to if treatment is individually applicable. Do we know that PRP in general has potential for HF damage, or just that Shim's cocktail has that potential? I could consider that if we are to assume that Shim's therapy has efficacy, then we should also assume that his solution to HF damage (which he claims is more quantity of the same treatment) is also efficacious?
I think that if you do chose to do an intratympanic injection, it is important to request PRP be distributed to the injection site's ear drum perforation. It would be great to minimize the 1% possibility of healing irregularity.
As far as attempting to self-administer intra-articular injections, I would strongly advise against this, especially when it pertains to neck or back; though if you are trained, and/or you simply know your capability better than I do, who am I to tell you not to? I didn't realize that
@EddieA's injection was self-administered, is this accurate?
We should keep in mind that no stem cells would be at work here, no vitamins or other additives that Shim has deemed, in conjunction, relevant and therapeutic.
The clinic can confirm that there will be viscosity of the PRP serum?
Also, you say, "they have an ENT there," almost like it could be an afterthought for this clinic. I would definitely look in to his personal credentials, and would be much more comfortable if he were somewhat aged, and with experience. Intratympanic injections are no joke.