Confirmation of blood cancer. It.

4months back my hb level is 13 gm. I have loose stools 6 times a day abdominal pain occurs so in february month I checked cbc accult blood stool, endoscopy, colonoscopy,liver function test, creatine,urine routine, usg abdomen ,prothedene time test, calcium test all r normal.from 3 months I have chest pain ,severe fatigue,tiredness. So I checked hb level is 9 gm.i have hypothyroidism since 7 years I take medicine.now tsh level is 0.59 it's normal.iron& ferriten all r normal vitamin b12 is only 10 ul/mg less lesser than normal.  but I am very tired what is the reason of this my hb is 9gm is this responsible for my weakness.never decreased my hb level.but I hav doubt can I hav lukemia.please reply.how to diagnose it.its curable.