Hopefully it doesn't take two weeks as I'm traveling next week to attend a workshop that will involve a fair amount of screen time. I still don't understand why anxiety would cause pain where I bump my head, and not just an exacerbation of pre-existing symptoms, but there's a lot I don't understand about all of this.

I feel like I am getting better at managing anxiety, and these extremes of anxiety/depression are getting shorter lived, but it's just so hard to go from feeling the best you've felt in a while to feeling back at square one. Throughout the past 15 months it seems like every time I see a light at the end of a tunnel, something stupid happens that shoots me back. I'm worried the longer this cycle goes on, the less likely it'll be that all my symptoms will go away and I'll feel relatively like myself again.

I did not say it will take two weeks to recover. I say I bet it may take up to two weeks to recover. I have experienced that two week recovery period from simple over-stimulation that is similar to the stress of a startle like you experienced. Add an anxious focus on "Oh no, I have re-injured myself" and that stress is magnified.

Rather than focusing on "When will this end?", I would simple expect a need to take it slow for a few days or more with an acceptance that mitigated any feeling or manifestations of anxiety.