Are there any immediate or short term symptoms of over exposure to lead?

Yes indeed!

There are signs of lead exposure that can show up quickly or in the short term; these symptoms may differ depending upon how severe the exposure is and the persons age or overall health condition. 
Common short term effects might involve stomach problems, like stomach pain (commonly known as "lead colic") feeling sick to the stomach or throwing up constipation or a decreased appetite which could result in losing weight. Symptoms related to the system such as headaches, feeling tired being easily irritated changes in mood trouble focusing, muscle weakness and a tingling sensation or numbness, in the fingers and toes may also manifest. 

Exposure to lead can result in anaemia which could show symptoms such, as skin and ongoing fatigue; for adults it may also elevate blood pressure temporarily; in children though it could lead to delays in development and behavioural problems like hyperactivity or irritability along with lethargy and reduced appetite; extreme sudden exposure, to levels of lead might cause seizures or unconsciousness requiring urgent medical attention. Signs of exposure, in the stages might not be immediately obvious; therefore it is crucial to conduct tests when there are potential risks involved.