What can cause low iron, low white blood cells, slow blood clotting, weight loss and easy bruising?
There is no way anyone on here can really tell you why you are losing weight and blood, you just need to trust your doctors for now and do all the testing they ask you to do. This could be anything really from simple ulcers to, cancer, celiac disease (have them take duodenum samples while they are in there, PLEASE) bleeding from any area of your gut, clotting disorders,etc. Not to scare you, but I just wanted to point out the range of possibilities and that some of them are scary and some of them not so much. Good luck and sorry for the lame-ish answer, but really no one on here can give you a diagnosis, your doctors are going to have to do a lot of investigating before they can give you an answer.