I'm not on thyroid hormone yet but I've read lots of people saying they feel worse before they feel better. Seems it takes your body 4 - 6 weeks to adjust to a change in dose.
I can relate about the Drs. not caring to get in any hurry. I'm in that boat myself.
I have a 16 year old daughter who was just diagnosed. I've been asking for an in-depth thyroid study for 9 years. Her symptoms have included anemia, speech problems (now we find out a swollen tongue is a symptom), soft tooth enamel and for the last 3 years she has had a muscular problem that causes her to freeze up and drag her foot. We've seen 3 neurologists and had numerous EEG's and MRI's, even a psychiatrist after being told (a lot) that it was in her head. Finally, after my insistance, they did a test of T3 and T4 and she was found to have low thyroid. She is taking Levothyroxin and is on day 9. She is noticing the tongue swelling is going down, but now it is causing more speech difficulties. Because there are no pediatric doctors locally, we will be going to Lucille Packard Children's Hospital (part of Stanford Medical Center). I've read several books and you should know there are allergic reactions with some of these medicines, and you should never get generic because they are too unstable. Also, many people need to try several medications before they get it right. We won't get in at the hospital for till the end of summer. I'm anxious to find out why she has low thyroid and if she will regain the muscles in her legs.