Hi.You have not stated when your grandma died. If it has been more than six months.. you should visit a psychiatrist asap. Have the other symptoms that you stated  arisen after this mishap? If they have been part of your personality since early days then you may need to visit a clinical psychologist.

Short tempered, Irritated, Fear, Performance Anxiety is all the manifestation of Low Self Confidence. I.f u learn to believe in yourself,  automatically all those above behaviour are taken care or could be handled  and can havw a great clarity about yourself . This is possible if u can consult a Psychologist and learn to overcome all those issues.

Hi, you have not been able to overcome the grief of  losing your Grandmother. This has led to Anxiety and Depression in you. Please consult a Psychiatrist who specialises in counseling. You can get over all your fears and anxieties through 2-3 sessions of counseling. In case the doctor considers medication for your Depression and anxiety , do follow it up with counseling. Hope this helps, All the Best!

It is common after going through something as difficult as the death of a close one to become very stressed and anxious. The anxiety you are having is causing you to feel frightened, and it is affecting your daily routine, work and sleep. Feeling low, having decreased confidence, impaired concentration or attention are symptoms of depression. As you are preoccupied with your anxiety it is causing problems at work.