I agree alot with Mary Alice. Your aren't going mental. You have suffered a great loss and are dealing with alot of stress at work. It's no wonder you are feeling badly.
It's tough to work thru stuff. It's hard to grieve but it's so important. The only way to move on with your life is to deal with what has happened and what is happening. After losing both your parents I am sure you are hurting very badly.

I hope you find a safe place and someone to comfort you as you go thru the grieving process. You're so young and you have so much ahead of you. Lots of life's struggles but lots and lots of good things too. It can get better. It will get better.

Moan all you want....I am having a day like that too :O)
Hugs,
Heidu

The highest reward for a person's toil is not what they get for it, but what they become by it.
John Ruskin