Hi Vanessa,
You've posted this same question in quite a few different types of medical communities, most of which i don't know how what you've described could even be connect to these types of medical conditions....please be wary of leading your self way off track googling your symptoms, googling and researching medical conditions is a well known behaviour that feeds anxiety and escalates medical related fears!
What you are describing imho would be suggestive-consistent with a situation specific posture related temporary nerve compression-entrapment, the specific areas of numbness you experienced suggests you were possibly sitting with your left arm bent at the elbow and wrist, your neck also slightly bent with the left side of your face leaning on or being held in your left hand.....as in you were likely unconsciously sitting in the same position leaning on the table for too long temporarily trapping the nerves. The same type of numb pattern you might experience if you were laying down, leaning on your elbow and propping your head up with your hand for too long...
" Ulnar nerve compression (see Figure 1) at the wrist causes numbness and tingling of the little finger, part of the ring finger, and the little finger side (ulnar side) of the palm. Ulnar nerve compression at the elbow causes not only the numbness noted above, but also numbness on the back of the ulnar side of the hand. Pressure on the radial nerve (see Figure 1) in the forearm or above the wrist can cause numbness over the back of the thumb, the index finger, and the web between these two digits. If the median nerve (see Figure 1) is compressed at or just below the elbow, numbness is felt not only in the same area as in CTS but also over the palm at the base of the thumb."
https://www.massgeneral.org/ortho-hand/conditions-treatments/pdfs/Numbness.pdf
The ulnar nerve is one of the three main nerves in your arm, it travels from your neck all the way down into your hand, and it can be constricted in several different places along the way, the most common place for compression of the nerve is behind the inside part of your elbow, Ulnar nerve compression at the elbow is called cubital tunnel syndrome.
Your anxiety and panic disorder unfortunately would of had to of kicked in within a few seconds of you becoming aware of the numbness ie no sensation, etc or becoming aware of returning sensations ie pins and needles, tingling, burning, throbbing etc if you were able to get all the way upstairs to a mirror and the entire event only lasted 1 or 2 minutes.......the likelihood of what you experienced for only a couple of minutes being anything clinically abnormal is highly unlikely!
Honestly it's much more likely to of been a temporary nerve entrapment from the way you were leaning on the table or the way you were sitting whilst at the table or what you were doing whilst sitting at the table for a prolonged period of time, consider what you were actually doing whilst sitting at the table eg holding a phone to your ear, head bent forward elbow bent whilst looking at your mobile or tablet, reading a book, typing on the computer, slumped leaning on your elbow watching tv etc etc to be a factor in what happened.
Any and all of those postural behaviours would be a perfectly normal cause and effect situation for what you've described happened and as you will probably already understand, your mental health situation has your fight or flight response on a hair trigger and anything that sets off your fear response can and will typically escalate your anxiety, your anxiety of something being wrong driving you to focus on worse case outcomes, driving you to seek answers, reassurance, make you hyper focus on normal sensations, experience what you perceive to be the same or similar symptoms to the medical condition your reading about etc etc etc IF your anxiety and fears are escalating, it's in your best interest to seek additional help and support specifically for your mental health issues so you are proactively focused on shutting it down before it spins out of control!
I hope that helps.......JJ
ps i wrote this in response to this question coming up in the MS community, which was removed before i had a chance to post my reply to you...
I don't want to sound simple here, but were you leaning on it while sitting at the desk? Because if you were, that's the cause. Pretty common thing. Can even happen if your posture at the desk was such that pressure from your neck temporarily pinched a nerve. I've experienced this a lot in my life, as has a lot of people, from leaning on it. You might not have been either leaning on it or were in a posture that put pressure on it, but it sounds like that side just went to sleep like when you sleep on your arm wrong. Hope it's nothing but that.