Yes, this happens to me every so often and I have Hashimoto's, but I was also recently diagnosed with narcolepsy, which is definitely known to cause hallucinations.
Either way, I don't think you're crazy. :o)
From the article "Twenty-Nine Medical Causes of “Schizophrenia” - Excerpted from Nutrition and Mental Illness by the late Carl C. Pfeiffer, Ph.D., M.D." This is cause number 4...
"Hypothyroidism
This is characterized by insufficient production of thyroid hormone. It can also be caused by poor metabolism of the thyroid hormone. The general net result is a slowing of the metabolism. This ailment is thoroughly covered in Dr. Broda Barnes’ Hypothyroidism: The Unsuspected Illness. Broda’s book discusses the fact that hypothyroidism may not show up on standard blood tests and further testing may be required (covered in the book).
Physical symptoms can include weight increase, sensitivity to cold, coarsened features, thinning hair, dry puffy skin, pallor, hoarseness, slurred speech, night blindness, difficulty hearing, vision loss, migraines, constipation, edema, anemia, joint pain, slowed pulse, muscle aches, and weakness, and low libido.
Mental symptoms include terrifying dreams, obsessions, frightening hallucinations, paranoia, suicidal ruminations, psychosis, depression, emotional instability, delusions, fear, suspiciousness, resentment, auditory or visual hallucinations, paranoia and psychosis.
Hypothyroidism often first manifests as a result of severe stress.
The book Natural Healing for Schizophrenia reports that 10% of patients diagnosed with "schizophrenia" have been found to have thyroid imbalances. It has been estimated that up to 20% of women over 60 have evidence of hypothyroidism."