Anyway to get my old Xfinity/Comcast email accounts back after yahoo conversion?

iPhone user here. I did the suggested conversion about 2 months ago, with the understanding that I would lose access if I didn't. When I did the conversion I had to create two new accounts in my iphone, and the old ones since they did not connect kept giving me errors so I deleted them. About a week later I realized my notes for those accounts were also deleted. And they do not move over with the 'new' yahoo accounts. There was some very important information in those notes that I really need to get back. I tried to add those old accounts back to my iPhone, but since I did the conversion they will not connect using the passwords that I used then.

Is there anyway to convert my email back to the xfinity/comcast email, and then I log in to those accounts and then capture the lost notes? I am pretty sure the notes are all saved under my primary email, but I would like access to both of them so I can be sure I get all of the info I am looking for.

Thanks in advance.

Tod [Edited: "Personal Information"]