Anger is a normal emotion. Its OK to be angry. Whats not ok and so many ppl have said is to let it control you and send you into a downward spiral. Stay busy. Busy as you can. When you feel you just cant, do it anyway. Get thru the day, wear yourself out if you have to so you can rest, then do it again. I didnt think it wuld get easier, but it did.
