PCL and Lilly, I'm so sorry to hear how tough it is for you at the moment. I really want to share my experience in case it helps, so here goes. (I'm not sure what your field is; I work in an office environment).
1. Choose 1-2 de-escalation techniques or grounding techniques that you can use when anxiety starts to rise, before it becomes overwhelming. Good ones for me are to repeat five things I can see over and over until I'm back in the present, or to touch five things while saying their name. (One drawback is that you may seem crazy, so I do it in the toilet at work if I have to.)
2. Play the long game with regard to bullies or potential obstacles. They might get the better of you or make you feel small once or twice, but just remember - and it's true - that these people won't prosper; they have their own inadequacies and are terrified you're going to see them; and you don't need their approval in order to do well.
3. If anxiety and depression are affecting you cognitively, write everything down - carry around a notebook or have a file open on your desktop. If you can keep track of all your tasks, then even when/if you don't complete them all on time, you'll know what's outstanding and don't need to feel overwhelmed or out of control.
4. Sleep well. Eat well. Exercise well. This is the hardest one for me because I live on adrenaline, coffee, and wine, but it's absolutely essential to me not being agitated or tired, which will lead into stress and anxiety. I spent years thinking this advice was probably true but a little trite, and a couple of breakdowns later I realise it's the key.
5. I tried schema therapy and my biggest lifetrap was fear of failure (duh); it was really insightful to see that I was a 'type' and that there were steps I could take to make changes in my life. My GP said that he sends patients to psychiatrists for medication and to psychologists for the mental work - maybe you would get something good out of trying a psychologist instead of psychiatrist?
PCL, can I ask what your anxieties around work are about? What are you afraid is going to happen? For me, for example, feeling out of my depth and under pressure made me overwhelmed and I was afraid I'd get fired, but I then catastrophised it into losing my house, all jobs ever, my husband, daughter, and eventually my mind. That sounds facetious, but it's exactly what I feared. Obviously I then just felt even more pressure and fear and so it all snowballed.
