Any obstacle comes in your life ..don't be upset, just be calm and accept it . Every obstacle will you teach you a lesson. Think about that..that will be a further learning in your life. That will be a pathway to your goal.
No one can harm you unless you harm yourself. You can refute, change and modify a challenge coming in your path.
Mind is yours, thoughts are yours, so you can not be sad unless you yourself feel sadness.
Obstacle is a learning. That comes to keep you in right path. That will uplift you further.
Time is going. Everything will pass away..even you and me also. So welcome all the obstacles. They will come and go. You should not be worried and feel otherwise.