Heya
Unfortunately, methinks you need to contact every place you've had medical help :/ Two things I'd say to look out for:
I've had to pay one PT for postage to mail it to me. If I had a fax, they would not have. Also, I was lucky to see several doctors and PTs under the same hospital network, so I called the general medical records dept and had them send me all my files- so in that particular case that was a "one place that had (most) everything".
But its always possible what you get is incomplete, so its real important now that you are taking this step to stay on top of it. 8)
good luck! Being your own secretary is a demanding job :/