Has anyone's anxiety ever effected them in moving up in work. Any advice?

So I've been with my job 8 years. I've been making about the same, but one of my coworkers recently got a raise and he's been there 2 years less then me. He said he just talked to our boss and asked for a raise. That just made me turn white because I have crippling anxiety. I have been there 8 years, been sick once and have ALWAYS been on time or early. So it wouldn't be unreasonable for me to ask for a raise. However my anxiety is so bad, I just couldn't bring myself to do it. I asked my sister for help but all she said was "A closed mouth don't get fed." Which is true, but doesn't help me. Has anyone ever been in this position or am I just weird?