I am not able to handle this stress each passing day.should I resign ?

talk to your HR and Project manager. And always remember you are hired because you have skills and talent.

Resign if there no debts and you can manage till you find new opportunity... May be you can withdraw pf

I don't have back up plan

Take leave and relax bro. What has to happen will happen. Hope for the best and plan for the worst. Planning should be done with a calm and practical mindset.

If you have a backup plan then you can