after I had showered getting ready to head out. I know the guy and we were going to have drinks. he took it while I was laying down on my bed checking my phone. I thought he was in the living room. I had no idea he was even near my room.
Your question was, "What am I able to do?" and you have some options.
The first and simplest option is to tell this fellow that he has illegally invaded your privacy and you want him to immediately stop showing the photo(s) to others and to delete/destroy all photos he has of you naked.
If he does not do this voluntarily upon your request, you can have an attorney demand the same thing of him. If he knows you have contacted an attorney, he might delete/destroy the photos upon receipt of the attorney letter.
If he fails to follow through with either your request or with the demands made in the attorney-letter, you could potentially consider an invasion of privacy/intrusion into seclusion lawsuit. A review of all facts would be needed to decide if this is an option worth the costs of pursuing.
Although most states have long-recognized "intrusion into one's seclusion" as a privacy tort, Illinois only officially recognized it in 2012. The Illinois Supreme Court adopted this privacy intrusion tort in
Lawlor v North American Corporation of Illinois, 2012 IL 112530 (Oct. 18, 2012).
The Illinois privacy action is based on the Restatement (Second) of Torts which says: "One who intentionally intrudes, physically or otherwise, upon the solitude or seclusion of another or his private affairs or concerns, is subject to liability to the other for invasion of his privacy, if the intrusion would be highly offensive to a reasonable person."
Both compensatory and punitive damages can be awarded.
Good luck.