Hello mjk201
Elevated levels of cortisol (a hormone produced by the adrenal glands) will lead to Cushing's Syndrome or Cushing's Disease, depending on the reason the levels of cortisol are high. The symptoms of both of those conditions are unlike those of ALS.
As far as thyroid problems and ALS: elevated levels of thyroid will lead to an increase in metabolic rate which could certainly lead to weight loss, including the loss of muscle, which are certainly signs of ALS . . . in addition to possibly causing fasciculations, which is also a sign of ALS. However, hyperthyroidism would also lead to elevated heart rate, heat intolerance, and a multitude of other symptoms that are not related to ALS symptoms.
I hope that helps.