Amanda - I have been thinking about this.
Let it be - be angry, be sad, be f**king furious. You are grieving, an unpredictable process at best. Given that you have two different losses to deal with it's not surprising you feel the way you do.
So what if you scream at him - it's nothing less than he deserves. If you don't feel up to going into work, perhaps you should speak to your doctor and get booked off for a while longer. Speaking for myself, this wouldn't be good for me though, I am a wallower - but you may be different.
Anyway, if you do decide to go in today, good luck!