((((Cyn))) I don't have a website to refer you, but I do want to say I can sympathize!
And I know you didn't ask, but I would try not to get too frustrated with your weight loss situation until you get your thyroid levels stabilized, for two reasons: The levels being out of whack could be interfering with your progress, and going too low in kcal intake will interfere with getting enough nutrition and can also affect your weight loss progress and general feeling of wellness.
I think you are on the right track with wanting to get a better idea of portion size, I have struggled most of my adult life with weight control, and that was one of the things that helped me be able to make different choices about what I choose to eat. I have a chart of portion sizes of foods and refer to it when I am unsure of something - but it typically uses volume instead of weight. Easier for me to eyeball, and easier for me to remember.
Other things that have helped me be successful in weight control (I have maintained a weight loss of appx 30% of initial body weight for about 2 years by doing this):
- I eat "regular" food - no artificial sweeteners, and full-fat foods vs low-fat or non-fat. This has been a key for me - your body needs a certain amount of a variety of naturally occurring fats to function in a healthy way.
- I weigh myself daily. It initially helped me to see how certain foods affected my body, and now it helps me stay on track and not go too far astray from where I want to be. It does fluctuate, but I keep try to stay within a 5 lb window, and it has worked well for me. Doing this helped me see that I do have to watch how much white bread/baked goods and sweets I eat.
- Don't go too low on kcal intake, in addition to getting enough nutritionally, I've found that if I go too low, I end up eating more later to "make up" for what I'm missing. Your body will also become more efficient, and will stop using so many kcals, unless you also change your activity level. Finally, too low of kcals per day will eventually make you feel "icky" in it's own way.
- I don't make any foods completely off-limits. For me, this always ended up causing me to crave things. If I know I can have some of "whatever", I tend to not think about it so much.
I hope you are feeling better soon!