Anxiety and in need of help

Hi,

I am currently really struggling at work. I have a high pressured job and and am considered good at it by my organisation and outside, however I am going under with the amount of stress. I feel like I am juggling so much responsibility that I am doing nothing right and failing everyone. 

After receiving an email yesterday from a colleague attacking me personally as well as professionally I woke up in the night with panic attacks.

My difficulty is I cannot communicate this to anyone. My social anxiety means I just shut down. 

I am nauseous and fighting back tears most mornings. 

I cannot take time off or not work.

I think I need autistic  specific support but don't know where to get it.

Any ideas?