I guess your doctor is suspecting you may have developed pneumonia due to night sweats and wants to do chest x-ray.
Do you still have headaches and muscle pains?
Are you experiencing chills and fever?
Personally, I don't think you have leukemia.
Your nosebleeds (more precisely dried nose secret with blood) probably, are due to sinusitis and nose inflammation.
Try to spray saline in the nose up to three times per day to avoid dry nasal mucosa and try to blow your nose more gently (causes damage of small blood vessels in mucosa lining and bleeding)
I hope you'll have your true answers when you get the blood check up and chest x-ray.
Best wishes!
Marija