Today I officially HATE my job

One of the ladies last week gave her two week notice. Since her client bills are printed the first of the month she was going to work until the 4th to get them out to be nice. Well, some people in the office persuaded her that it would be better to leave on a Friday and not Tuesday. She walked into the office today and gave a revised departure date and told the Manager we had talked her into it! I dislike people who can't seem to make up there own minds or use others as an excuse for wanting to do something. She spent all day beaming with glee that she was leaving. Which I do not begrudge her because I would feel the same way. But, then the manager yelled at everyone and said we were doing the client bills and taking all the calls. She would not be helping at all. I told her I thought we had a procedure written down to sort out the doctors, fax certain ones and mail the rest. She said she didn't care about anything and if we screwed it up it would be our own fault. She is already upset because one supervisor is out after shoulder surgery for at least another month and the other one is out for two weeks. She may be gone longer if she has to have back surgery for 5 herniated discs. I know she is under stress. We have tried to help and offered to take some of the load. We either know how to do it or could learn fast to help. I have been there FOREVER and long before her. I just resent being treated like children and being punished for someone else's decision.
I am tired of putting up with things like this all the time. I love the coworkers but the manager has a really bad ROYALTY complex. I really want another job. I know I could do well wherever I go. I know the kind of job I would like to have and know I would be GREAT at it. I just have to be given a chance. I have had many people tell me to 'do it' and even professionals in the business wonder why I am not in it with them. hahaha
Sorry for the rant-I just had to unload. I promise the next one will be lighter.