Why did you have it removed? I had thyroid cancer and did not get any synthroid until 7 weeks after the final surgery because I needed RAI and they want you really hypo for that. My TSH rose to 186...I was VERY hypo. So the answer is, don't panic, you can actually go at least 7 weeks! I got my synthroid the day after the dose of RAI.
You are definately cold because you're not producing enough of the thyroid hormone. Did you Dr tell you why he/she didn't give you any meds? If you were really hyper before it's possible that your Dr felt there was still enough thyroid hormone left in your body but that's not always the case. If you're taking that much calcium your parathyroids were probably bruised or removed during the surgery. They impact your body's abililty to absorb calcium which is critical hence the large levels of calcium you're being asked to take. I would talk to your Dr and get as much information as you can.
I would be giving the Endo a call and asking for thyroid replacement.,
You are cold as your thyroid is gone therefore you arent producing thyroid hormone.
Coldness is usually a sign of HYPO and you do need to get some replacement into you.