I think people are conflating a few different events.
Thor's alter ego was an EMT or paramedic for a time.
There is a scan, available on Google images, of someone handing Mjolnir to terrible 1990's Thor, Thor saying thank you, then basically going "WTF JUST HAPPENED?" You can't see who is handing it to him in this scan, but apparently it was Wonder Woman. In this scan, Thor does indeed seem to be injured after a serious brawl.
This is the more common and easy to find panel
And this is the harder to find preceding panel, revealing that the mysterious person was Wonder Woman.
- There are other images where a normal looking guy in street clothes is standing next to Thor, picks up Mjolnir, and uses it to defend himself, apparently a story where Thor and his alter ego were separated and able to exist alongside each other.
Put all of that together and you might end up with a headcanon scenario where everyone thinks they remember seeing a paramedic hand Mjolnir to Thor. A lot like the infamous nonexistent scene in Star Wars where Luke misses his first throw of his grappling hook.
Note: I don't think it is out of the question for a paramedic to lift Mjolnir, necessarily; he would be trying to help Thor, have good intentions, and be a decent person who had devoted his life to helping others in time of need. This certainly counts as "worthiness" in my book, but who knows if Mjolnir and/or Odin would agree with me.
Thanks to Nerrolken for adding the first two pictures