If you sent him a donation, here are some consequences. I don't think that I can give you advice on what to do, but I'm sure you're smart enough to understand.
1. Whatever return address you used to send the money, that address can be subject to a search warrant.
2. If you e-mailed him, you certainly have the right to unsend those e-mails. Some secured e-mail sites allow you to revoke his access to those e-mails. Since he probably won't have any access to those e-mails, there is no need for him to have access to your correspondence. And there is no need for anyone else to read those e-mail and possbily misconstrue their contents. That information is conditioned on the fact that the e-mail is not evidence of a crime. I cannot and will not suggest that you destroy any evidence.
3. If you sent e-mail to him from your own computer, law enforcement certainly has probable cause for a search warrant to search the location at where the computer is located (i.e. IP address).
4. If law enforcement comes to your door, politely ask them if you are under arrest. If they say "yes," then say, "I want my lawyer." If they say "no," politely say that you are leaving, and if they want any information, they can contact your attorney. If you don't already have an attorney, go to a public defender's office and explain your situation before law enforcement shows up. Get a couple of business cards from the attorney with whom you spoke. You then have an attorney with whom law enforcement may speak. I have done that several times for walk-ins at my office.
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