Do you have pain during passing stools? Or is it painless? Do you have frothy, bulky or smelly stools? The needles & pins sensation over your stomach and back alongwith bloating
can be due to nerve
dysfunction or vitamin deficiency
due to some worms or improper digestive condition called malabsorption syndrome
. Whatever it is, you need to get your stool checked for blood and fat. Also your blood needs to be checked for Complete Blood count
(CBC); specific vitamin blood levels like Vit B12 may need to be done later on after consulting your doctor. Whatever happens, keep me posted at firstname.lastname@example.org
I hope this advice is of use to you.