what should i do when my username and control number of ignou is lost and also not there in mail
Well, not to worry about that, you can visit your nearest ignou regional center for your control number, they will provide you after getting some details about you. In online then there is also a tab provided for forgot username and after filling the details you will get the same on your mail id. Same click on forgot password and fill the details.
Give a try once, dont worry.