Hey, I struggled with weight loss ever since having been diagnosed (about 13 years ago - I was about 20 years old) but now seem to finally have overcome that plateau.

I just checked the brand of your medication (synthroid) and it does contain the same active component (thyroid hormone - levothyroxine) as my brand does. So the advice I could give you, might be transferrable to your situation.

Firstly and most importantly, make sure to get your blood checked at least every 2-3 months for the first year (after that: every 6 months) because it is essential to figure out the right medication dose for you. This could take a couple of month. Even after you are leveled to the right dose, the thyroid hormones your body is still able to produce on its own, may vary from time to time - so a regular check-up is indicated.

Secondly, make sure that you take your medication first thing in the morning on an empty stomach and do not eat or drink (unless it is pure water) for at least 20-30 minutes after you took your medication. I just changed that about three months ago - always thought, that it was not that important and mostly had a caffe latte immediately after having my medication.... wrong! It really made a difference for me and now, I am able to lose weight at a normal/healthy rate (i.e. 1-2 pounds per week) by watching my diet and exercising regularly.
Reason: the effectiveness of the thyroid hormones and the absorption in your body are affected by certain other foods and/ or food supplements - especially calcium, iron and soy products.

Interactions:
There are also foods and other substances that can interfere with absorption of thyroxine replacement. People ought to avoid taking calcium and iron supplements within 4 hours, as well as soy products within 3 hours of the medication, as these can reduce absorption of the drug. Grapefruit juice may delay the absorption of levothyroxine, but it is not believed to have a significant effect on bioavailability. Other substances that reduce absorption are aluminium and magnesium containing antacids, simethicone or sucralfate, cholestyramine, colestipol, Kayexalate. A study of eight women suggested that coffee may interfere with the intestinal absorption of levothyroxine, though at a level less than eating bran. Different substances cause other adverse effects that may be severe. Ketamine may cause hypertension and tachycardia and tricyclic and tetracyclic antidepressants increase its toxicity. On the other hand lithium can cause hyperthyroidism (but most often hypothyroidism) by affecting iodine metabolism of the thyroid itself and thus inhibits synthetic levothyroxine as well.

Source: Wikipedia / Levothyroxine

Wish you all the best on your journey!

When was the last time you had your levels taken? I need mine to stay in the 1.5 range to feel normal, but everyone is different and it's possible you need a higher dose. I've been on the same dose for years and years. It took me a year to lose 35 lbs, but the weight came off pretty steadily as long as I ate around 1300 calories a day. Any less and I'd plateau.

Generics can be up to 10% off from the name brands. What I've seen is that some people need the consistency of the name brand, but others do well on the generic. We're all different.

There are tons of symptoms - many of which can be "written off" as other complaints. Personally, I've had the following:
Extreme lethargy to the point I'm falling asleep while driving
"tennis" elbow and other joint pain
vertigo
dry skin
croaky voice (my thyroid goiter is pushing on a nerve to my vocal cords)

I've been very lucky. The lethargy and vertigo are controlled by meds. Lots and lots of folks have it much worse.

Levels are the key.

For some people low carbs is the answer - and by carbs, I mean sugar, starches, bread, pasta, cookies, cake- "white food" that has no nutritional value. If you haven't lost weight in months despite watching calories and exercising you have to look at what your are eating as well as how much you are eating. For me, not eating sugar and starches is not a fad diet - it's a way of life and I will not eat them forever. I do however eat tons of vegetables, fruit, coconut water, almond milk, etc. - good nutritious carbohydrates with the nutrition that my body needs to be fit.