I dont know if you're still looking for an answer to your question of whether Mike Bloomfield played at the Fillmore West in '69 or not, but I think I could help.
Yes, he did play the Fillmore in '69, quite a bit, I believe. And, yes, there are recordings of it. These dates, I know for sure, he did play: 1/31, 2/1, 2/2 and 2/8, all in '69. As far as official releases of these, there is an out-of-print album called "Bill Graham Presents Live at the Fillmore West Mike Bloomfield" (or something like that..); however, it's out of print but is a circulated bootleg for those who converted their albums to digital. If you can't obtain a copy of this out-of-print release, some of the tracks have been released on Nick Gravenites "My Labors" album. As far as the February dates in '69, I dont believe there are any official releases but there are widely circulated soundboard bootlegs out there.
Being a San Francisco resident, I'm sure he played many more dates than those listed above. Maybe someone in the "know" could add to the above or correct me if I'm wrong.
Hope that helps...