Well done for finding a solution and being honest about your situation to colleagues - we can't guarantee they'll all understand but it sounds like you have some good guys there. 'Anxiety' can sound like a dirty word to some employers, as they believe that it's used as an excuse and seems frivolous to those who haven't experienced it. Please rise above them though and don't let their ignorance cause you any guilt.
I recently had to do something that felt extremely out of my depth work-wise, right in the depth of hormonal hell! As the adrenaline rushes were there anyway, the task at hand turned into a distraction and the level of nerves was much the same (as there's only so much adrenaline we can pump out!), considering how important the people were who I had to impress. All went very well and it's now given me the confidence to not turn any other opportunities down.
I know it's a scary time, however, the adrenal rushes are not dangerous and reframing that can really help once you just allow yourself to ride them out, if that makes sense. I too used that BB as and when at the beginning (before the pill calmed a lot of it down) and it worked really well for me. I didn't want to take as a course in case of any dependency/withdrawal effects. However, as the others mention, a constant low dose is another option if you find the gaps in between are too overwhelming.
Good luck with gradually getting back to work and, if you end up feeling the job is too demanding at this time, then maybe consider a new, more relaxing career, if you have the option.