What can I do if I consulted an attorney and then he went to the opposing counsel and divulged the entire conversation?

Since you consulted him to get his advice, with the prospect of retaining him, in my opinion he was obligated to protect your confidences. File a complaint with the local grievance committee. Be forewarned, however, he will come up with all sorts of excuses and obfuscations to avoid censure: you weren't his client, there were no grounds for confidentiality, he didn't say anything damaging, opposing counsel would have found out everything anyway, you would have been obligated to disclose this information, etc. Then you have to prove that what you say is actually what happened