I had a lump in my throat that felt like I had a pill stuck, I had trouble swallowing pills, and had a sudden increase in my weight too. I found out that it was due to a very unusual presentation of a swollen thyroid with only the back side of my thyroid swelling. I had to get up to 1.5 grains of Armour thyroid before the swelling went down, but only 2 days of being on the dose, it went down. All of my blood tests were within the "low normal' ranges.
Now that I'm up on 1.75 grains a day, my weight is starting to normalize. If you really feel you likely have something going on with your thyroid - keep pushing. I finally found a doctor that would listen to me and really check it out by using the "Good Doctors list" that can be found here:
www.stopthethyroidmadness.com/