For about 6 months my son in law has been suffering from extreme dizziness, headaches with tunnel vision and night sweats. He finally saw his doctor 2 weeks ago the doctor told him to take Dramamine and let him know if it got worse. The symptoms have gotten worse and the doctor ordered blood tests 2 times and now says that he has a chronic type of leukemia. I have read a lot about leukemia and do not find anywhere where it is indicated that dizziness and tunnel vision are one of the symptoms. Would you expect that maybe there is a secondary problem going on? Also, is it really possible to make this diagnosis without any biopsies?