Scaring yourself over mis pronouncing s's t's and th's? Been there ,done that, got the t shirt. Anxiety causes you to be hyper sensitive to your speech and notice little imperfections that you will convince yourself is bulbar ALS. If you had bulbar onset ALS, you'd have problems with slurring and or swallowing thin liquids, voice projection, not extra whistling sounds. From the considerable amount of research I've done, bulbar onset is supposedly the most aggressive and outwardly noticeable type of onset. If it was subtle, it wouldn't be for long. It also is the rarest onset and tends to mostly affect older patients. You don't have it.