The pins and needles in your hands could be pregnancy based carpel tunnel syndrome. You can ask your health care provider about it when you see them.. Its always worst in bed causing regular sufferers horrific sleep patterns. My DH and brother were/are both woken up every 2 hours with no feeling in their hands which with a bit of time went to paraesthesia before coming good and letting them get back to sleep.

The metallic taste is fairly normal too sadly. Its called dysgeusia and is believed to be caused by estrogen fluctuations during pg. You can try and expel it with strong sour/citrus foods or foods soaked in vinager (pickles! Ice cream not recommended in winter!)