A detailed evaluation by a Psychiatrist would give an idea about how much your stress is contributing to the poor results. According to that, you would be advised appropriate medicines or psychological counseling or both
Next Steps
please visit a Psychiatrist ASAP so that they can guide you and help you out of this rough patch
Health Tips
make sure you have:
-atleast 6-8hrs of night sleep
-nutritious diet
-adequate hydration
-regular exercise like walking or yoga which relaxes the mind