I think multitasking is a bad thing. If a thing is worth doing, it should be done on its own. Trying to do multiple items at one time only leads to you doing none of them properly. On a more basic level, allowing yourself to be pulled into mental jijitsu on a repeated basis would be exhausting and not healthy. Anyway, WebMD has a nice article on “How to Multitask Without Losing Your Mind”. My advice still remains, avoid it if at all possible but if you must, read this.