the hard
lump on the bottom of occipital could be due to swollen lymph nodes
behind the ear and head due to different infections like scalp infection, allergies and cough / cold. Check for anemia, endocrinopathies, electrolyte abnormalities and dehydration, micronutrient deficiencies etc could cause dizziness, headaches, and achy legs. Consult a physician for detailed examination and relevant intervention. MRI brain should also be done to check for any tumors in the brain.