As someone who has had similar happen (loss of sight/hearing/sensation of touch, but not fully unconscious) on numerous occasions, it's understandably very spooky, but genuinely the thing that helps me the most is laying down, slowly drinking water, and not doing much else until sensation mostly returns. This is to say - if you're scared about something medical, it's always good to get help, but don't beat yourself up too much in this case because your backup plan is what someone else in your shoes would do/has done. ;u;b