I have Low Thyroid and taking Levothyroxine for almost 30 years now. I had most of the classic symptoms, especially constipation. I discovered that I need to take the Levo very early in the morning, more than an hour before I actually get out of bed. Of course, on an empty stomach and only with water. Also, be sure that you are storing the Levo away from heat and light and moisture. Best to keep it in the original RX bottle. My go-to breakfast is 1 minute Oatmeal with whole chia seeds, ground flax seeds, added fiber cereal (Bob’s Red Mill) and a small amount of nuts, honey, and milk.
Start with 1/2 serving of the oats, 1 teaspoon of the fiber/ flax/ chia. Add 1/3 cup of water. Microwave for 1 minute. Then add the honey & nuts. (Honey is more healthy if not microwaved.) Add a splash of milk and a dab of butter to your taste. I also change it up by adding Vanilla Extract or some other flavoring on occasion, and changing the nuts to suit my mood. The amounts of the additions can be customized for your needs and tastes at any time. Chia seeds absorb lots of moisture in your gut, so they help keep the waste matter soft. (Drink lots of water to help it do that) Also note: ground Flax seeds should be stored in the fridge. By doing this, I went from a BM every 3 to 4 days, to EVERY MORNING! I hope this helps you, too!