I Had A Vp Shunt Fitted 2 Weeks Ago And

I had a vp shunt fitted 2 weeks ago and since then I have had realy bad pains in my stomach which I can only describe as electric shocks going down my legs and bad shooting pain up my bottom I have been back to hospital and they scanned me and said the shunt seems to be working fine bu had no explanation for the pain I am having . It's getting me down now I can't walk or sit down when the pains start