I don't know as I have any particularly good suggestions for you here. But anger is something I have way too much of! I can't say whether more Effexor, or a different or additional medication, might be helpful for you. Perhaps other PC members will have some thoughts on the subject they can share.
Here's a link to an article by DocJohn, from PC's archives, that provides links to additional articles on the subject of anger:
Anger Management | Psych Central
And then here's a link to Aaron Karmin's Anger Management blog here on PC as well:
Anger Management | A blog helping you to better manage your angry feelings.
Best wishes...
P.S. It appears this may be your first post here on PC. So... welcome to Psych Central.
I hope you find PC to be of benefit.