Sleeping issu due to over thinking. Me.

Im not able to sleep since last two night due to over thinking. I appeared in Competitive exam in the month of feb. and its result didnt go well and also in next gov. Exam i was not able to apper due to fever and fue of my friends did very well in that exam and getting good marks. And these type gov. Jobs comes rarly after 2-3 years. Now im totally hopless and i used to thinkg about all these things day and night. Even i try not to think about but still able to forgot those things and worried about my future. 7-8 days before some times i used to clonapit -.25 mg table which gave me relex but someone told me that it is harmful i stop to take it. But now im not able to sleep since last two nights.plz help me.