Anxiety can cause alterations in breathing patterns and it may be that you are holding your breath or breathing too rapidly which can cause fatigue . There is something you can do right now to stop it.....initiate proper breathing. You can help alleviate the feeling of throat tightness, panic and and shortness of breath by changing your breathing pattern to abdominal breathing. To abdominal breathe ( which is a much more effective breathing technique) place one hand on your abdomen and one hand on your chest... watch to see which rises. It should be the abdomen, NOT the chest.Practice breathing using your abdominal muscles... (to breathe with chest muscles causes fatique and more shortness of breath) by taking in a deep breath through your nose.. making sure only the hand on your abdomen moves, slowly.. and exhale slowly through the mouth.. your abdomen should flatten with exhalation. Do this three breaths at a time. Breathing correctly will immediately eliminate anxiety...., every time. If it comes back do it again.
COnsider taking extra hydration ( atleast 8 glasses of water per day), this will help as well as destressing through the use of biofeedback and relaxation techniques ,
definitely plan to get adequate sleep. Sleeping is so important for over all well being.
They would be really big and really hard and visible.
Here is an interesting article and video:
I will give you a list of some of the best stress management books that I am familiar with:
I hope this information helps you. If I can help further just let me know...and please know that you are ok:-)))