If your testosterone is very low your estradiol will be lower as well. Estradiol is important for bone mineralization/remineralization (along with Vit D, K2, A, oestradiol and parathyroid hormone). You need about 18 ng/dL of estradiol to maintain calcium balance in the body. If you upset calcium balance your body sweats it out.
I know I get pretty bad middle of the night sweats every time I end testosterone treatment (e.g. via cream, or halt HCG, or, far less pronounced, clomiphene). Vitamin D3 (especially via sun) makes things worse during these periods. The above is my theory of why its happening, would be happy to add scientific references if anyone would like to read the background.
From a very quick scan of your recent posts, don’t see where you’re taking arimidex or something similar.