Guilt.... and vision problems

Few days back... i was doing my support work as usual when i was supposed to help fix a customers site instead i screwed it even further.... the feeling is indescribable. Its the opposite of what i am supposed to do. Then i wondered even a small thing like this can cause such feeling of guilt, imagine what goes on in the mind of a criminal who intentionally does evil deeds just for personal gain. Lately i realise my vision is deteriorating... sometime the images i see looks blur. Whats happening to me .. to my eyes... my life.. im losing sight of things that are really important to me. Somebody help me....