I am 16 months on from my TT and I still have low calcium issues.
If calcium carbonate is not working for you then try calcium citrate. This tends to absorb better in the body. You will probably find, like I did that my Vit D was very low. I now take 2000 iu of Vit D and my calcium levels are good. Mind you I still take 5 x 600mgs a day of calcium! But I no longer get the tingles etc you mention.
As Trish above says, you must spread the tablets over the day. I take 3 in the morning (about 4 hours after my thyroid medication) and then 2 later in the day.
Do get some Vit D and try the calcium citrate. I am sure you will feel better with in a few days!
Cheers!
How much calcium are you taking, and are you spreading it out throughout the day? Don't take any calcium supplements until 4 hours after your synthroid because it will intefere with absorption of synthroid. We can only absorb 500mg of calcium at once, so that is why it is best to spread it out. It also helps to take 1000 iu of Vit. D with the calcium to help with absorption. You could request a bone density test if you are concerned about your bones. I had one recently and it does not take long. Good luck.
Trish