What Causes Heaviness In Head?

hello doctor i am doctor ashlesha...my sister is suffering from heaviness in head,she feels that she will fall as she steps for walking,she feels some eye movements..her history is that 3-4 months ago she diagnosed with cervical disc herniation,she had symptoms of disbalance,weakness in hand,tingling sensation in hands and feet for which she got treatment of steroids..now all her neurological sign and symptoms are dissapeared,but still she she thinks tht she hv some problems..we hv shown her to so many doctor and every doctor have excluded all possible reasons for her illness...so we are thinking it may be psychological can u help us