5 mnths now 3yr old has abdominal pain, body aches, very pale, very fatigued, headaches, pain under left rib. seeing paed next week. scared leukemia?

Chronic symptoms: It is uncommon for pre-schoolers to continue with persistent specific problems for long periods of time without having a condition that requires evaluation and treatment. It is appropriate to be concerned, but a wide variety of conditions can be responsible for the symptoms you describe. Try to stay calm and make sure you keep your appointment.