It's hard to say, but looking at your diary, it appears you are using measuring cups or guessing rather than using a scale and weighing your portions. You are likely underestimating how much you are eating. I've heard many people complain that 1 T. of peanut butter can often be closer to double the calories once they weigh it. Also, many entries for foods in the MFP database are incorrect. I often have to Google foods first (USDA or Calorie King seem pretty good), and then try to find the correct one in MFP.

I'm 5'8" and 184 pounds. When sedentary, I maintain on around 1650 calories. I find the calculators/MFP guides just don't work for me. I have not been diagnosed with a thyroid problem either, but suspect there may be one lingering. Still, I've been able to lose weight just by carefully tracking my numbers and weighing everything I eat whenever possible. It just means we can't eat as much as others.

Not sure of your stats, but if you haven't lost in the last month, maybe calculate your daily total from what you've logged for those 30 days. Assume you are mis-measuring or forgetting to add a few bites here and there and add 200-300 calories to each day. Then divide the total by 30. Guess that to be your maintenance level at your current activity level. Then decide how much of a deficit you can live with (500 calories/day?), and try sticking to that while carefully logging for another four weeks. If you lose a lot more than you expect, you can increase your calorie goal slightly. If you don't lose at all, then you know you were grossly underestimating before and need to drop your daily calorie goal a little more. If you gain and you've weighed your food and logged diligently . . . take your log back to your doctor and ask for more tests.

Hang in there. 6 pounds in 6 weeks is still fantastic! Good luck!

Measuring cups (tablespoons, etc.) can be quite incorrect. The 1. T. of peanut butter you measure out with a Tablespoon might actually weigh (using a food scale) 32 grams instead of the 16 grams listed on the peanut butter jar - a double serving = double the calories.

1/2 c. of taco meat in your taco salad might not be 150 calories. I had a small serving of taco meat last night (I'll guess between 1/4 c. and 1/2 c.) using lean ground beef. It weighed 3.2 oz. once cooked, which worked out to 233 calories, plus I had to add the calories from the seasoning.

Or another example is that avocados come in varying sizes. Half of one might weigh 30 g or it might weigh 60 g. 1/2 c. of fresh blueberries for me weighed 125g or 71 calories; you've logged 1/2 c. as 30 calories.

Some can lose without logging. For me, it takes weighing everything, logging meticulously, and a lot of patience.