Usually by now, the conspiracy theorists have shown up and started questioning the OP's story.
I remain a bit confused about the details. The OP is was a "senior" level surgery resident, hence presumably a PGY-4 or 5. They resigned from their program because they thought it had too many problems. Still would like to do surgery, but can't get a letter from their PD. Thinking about OB.
It seems equally possible that the OP was terminated from their residency. Otherwise, it would have made much more sense to try to transfer gracefully rather than resign suddenly. Or, finish training and consider a fellowship if you didn't feel competent. Or, if the OP was a fine surgeon in a bad program and left, the PD might be willing to give him/her a letter to continue, as not all surgical PD's are vindictive lying bastards. Although, according to rumor, most are.
I'm not suggesting that the OP is lying. But, I get the sense that there is more to the story then we are hearing. And these are his/her only posts, so there's no backtrail to follow. Leaving an advanced surgical position without a fallback plan is exceeding foolish, IMHO. Sure, sounds like his/her program might have sucked. Is on probation. So is Mass General (Note: Tried to stick a link on that, won't work. You can look it up yourself
here). There are other ways to address poor programs, other than dropping out -- which honestly hurts the resident and doesn't fix the program.
I need to go put my foil lined hat back on now, to keep out the mind control signals.