All I can remember is I originally watched it on syfy's website ....after it was gone I had to watch the others on YouTube ..I never finished watching them but would LOVE TO.. The man wakes up not knowing what has happened and I believe he used to be a cop if I remember correctey. There is bits I can remember about the 4 horsemen of the apocalypse
This is Amnesia, whose plot is described on IMDb as:
Man wakes up in a post-apocalyptic world with amnesia and is looking for his family despite being pursued by a ruthless army.
There doesn't appear to be a formal relationship between the project and the Scyfy Channel. The series' creator, John Wayne Bosley, had made a pilot and was hoping for Scyfy to pick it up as a mini-series. Scyfy appears to have posted the pilot (or parts of it) on its web site, perhaps to gauge audience demand.
It doesn't seem to have gotten a pick-up as of this time, which is probably why you had to see the rest of the episodes on YouTube.
Six episodes have been made so far.
There is also a Kickstarter fund that's been organized to keep the show going, so if you like it enough, you may wish to contribute to it.