Maybe I can help ...
When the hair samples were sent to the state health department, did they see the bugs, but couldn't identify them? Or did they not even see the bugs in the hair sample?
Do you still see places on your hair that look like nits?
What did the dermatologist say?
I once had a patient who didn't believe me that she had lice in her hair, but she allowed me to cut off some hairs (where I saw nits) and send them to my lab. At the lab, they looked at the hair under the microscope and confirmed that there were nits. I sent the hair in an empty test tube, for lack of a better container.
I mention this, because I think that you could ask your doctor to provide you with a sterile container that, when you or he/she find some of the bugs, whether they be on your hair or whether they flake off, as you said ... you could put them in the container for your doctor to send to his or her lab for microscopic analysis.
I think you must quit putting all these crazy things on your scalp ... Clorox, Tide, Baking Soda, Flea & Tick Spray, etc., etc.. Some of these can do just the opposite effect ... they can make your scalp more irritated and itchy than it already is. Also, an irritated, itchy scalp will feel like there are bugs in it ... even if there aren't. So, you want to reduce the irritation as much as you can.
Of everything you've mentioned, I suppose I would continue with the Kenalog spray, hydrocortisone, or Dermasmoothe scalp applications until you can get a hair/bug sample analyzed microscopically by your doctor's lab. Even though these products are not what kills bugs, they are substances that help calm an inflamed, irritated scalp. That will do a lot to help you feel better until you can clarify the problem.