I am not diagnosed with anxiety, but it is a terrible symptom and I used to have torturous panic attacks amongst many other symptoms.
Anyway, 4% of the population has these. In a condition called ME/CFS around 80% or more have them.
There is a couple places they can be. I attached a file to give you an idea where they are and what they look like. They are just darkened crescents in your throat. If you look at someone healthy, the tissue is all the same color.
I attached a diagram where these crimson crescents appear.
There are many pictures of them here: http://forums.phoenixrising.me/showthread.php?5118-Do-you-have-crimson-crescents/page2#post_message_83506
Browse pages to see more pictures. Some are good, some are bad. Mine our very obvious, but I don't have a picture on my computer. If it's not obvious to you, you can compare yourself to a healthy person.
If you don't feel confident if you have them or not, please reply that you are not sure.