Hi Sunflowersunshine
Sorry to hear you are having a rough morning.
Can you get outside or open a window to get some fresh air even just for a few minutes? The do some deep breathing exercises away from your desk.
Yes affirmations are a good tool too..as well as saying them, could you write them down to look at. You could write things like:
I am safe
I have a good job
I can do this!
I can breathe through this.
Some people find calming music helps in the background . I prefer to put on something up lifting that I can have a quick dance to!
Take care honey..you can do this! X