First of all you not alone as we are all here for you so please take some comfort in knowing we care. I spent 2 really down days on Tues and yesterday. First time I have gone back to bed and spent most of both days in bed and much like you I cannot just sleep the day away so I resorted to using my medication for anxiety.
I am glad you saw your Dr. and remember no news is good news. If there was a test result way out of the normal range you would have had a call back from your Dr. The symptoms of anxiety attack will positively respond to panic-control techniques. Deep breathing and relaxation exercises, switching the focus of thoughts to humorous or pleasant events or ideas, doing math problems or counting can all draw your attention away from the chest pain and other symptoms of panic attack, usually within a few minutes.
I know from my own problems that the anxiety can feel like it is ruling your life but never give up on finding a way to keep it from taking control.
Remember it is ok to be human and as human beings we will have stress and anxiety in our lives but anxiety is not who we are, it is a disorder we can learn to control.
Gentle Hugs to you,