Uncertainty whilst making wudoo’
Question

                Sometimes it so happens that I forget whether I have wiped over my head or not, and I am not sure one way or the other. Should I do wudoo’ all over again?
Praise be to Allah.If this uncertainty come after you have finished 
          doing wudoo’, then do not pay any attention to it. If it happens before 
          you finish, for example, being unsure whether you have wiped over your 
          head and you are washing your feet, then you can wipe over your head 
          and wash your feet. There is no hardship involved in doing that. This 
          is if you are not  suffering from a lot of insinuating doubts. 
          If you are faced with a lot of insinuating doubts, then you should not 
          pay any attention to that, and you should proceed from the point at 
          which you are now. So if you are washing your feet then you may assume 
          that you have wiped over your head. The same applies to all other stages 
          of wudoo’.