Coping with the Inner Fluctuations

I'm trying very very hard not to expect things and just do my best. However, some things keep haunting me, like LSM2104... argh. I know that all I have is not mine. Why do I set such high standards for myself? Sometimes fear grips me, that I will disappoint myself terribly. Maybe I'm just a little stressed. I hope that I'll be able to handle whatever comes. Please let me be able to handle it. Please don't make me go through what I went through during the release of my A level results... please just let me do my best. I wish I didn't have to be bothered by this. Please help me cope whatever comes.