, "typical, common;" 1640s, "standing at a right angle," from Late Latin normalis "in conformity with rule, normal," from Latin normalis "made according to a carpenter's square," from norma "rule, pattern," literally "carpenter's square" (see norm ). Meaning "conforming to common standards, usual" is from 1828, but probably older than the record [Barnhart].
As a noun meaning "usual state or condition," from 1890. Sense of "normal person or thing" is from 1894. Normal school (1834) is from French école normale (1794), a republican foundation. The city of Normal , Illinois, ., was named 1857 for the normal school established there.
I have been down a similar path in finding out what I have and what to do about it. Cleveland Clinic was instrumental in getting me the help I needed. After seeing a multitude of doctors I was referred to one at The Ronald Reagan Medical Center at UCLA. He is the head of the Hydrocephalus Department and recognized my symptoms right away. He told me that I needed a shunt or I would be risking an unpleasant death. I had to be in the hospital only one night and went home the next day feeling like a normal human being again. Do not fear the shunt,it is nothing short of a miracle. Good luck to you. There is hope.