HEY justnothing: I'm glad that you reached out to your HR department at work. Many employers have resources for and/or make accommodations for employees dealing with problems.
Are you getting any counseling outside of work?
Is it possible to take a break or two during the work day and get out for a walk (perhaps at lunchtime, or break time?). A little burst of exercise can be helpful. If there are stairs, in your building, perhaps a few trips up and down some stairs could give you some exercise.
In some circumstances, people are able to take a break and go to the restroom and do a few physical exercises in private. Sometimes, just sitting and privately doing some deep breathing exercises can be helpful.
Keeping busy can be helpful. If you have slow times at work, can you ask for something to do to benefit your employer? What can you do while sitting at your desk?  :)o you have a computer? Can you access your own smartphone? Is there something you would want to do, during slow times?
THE BELOW LINKS GO TO A FEW IDEAS THAT MIGHT BE HELPFUL:
PANIC LIST FOR DISTRESS TOLERANCE
www.dbtselfhelp.com/html/panic_list.htmlBREATHING EXERCISES
www.drweil.com/drw/u/ART00521/three-breathing-exercises.html