From this description, it doesn't sound promising. You seem to be living in a home where you don't have exclusive rights of possession. In that setting the owner can give permission for a search. Plus, if nothing was seized, and you weren't charged, you have no recoverable damages. While this is intrusive and disturbing, it's not enough on its face to justify a lawsuit.
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Violation of civil right if you can prove the personal vendetta as the intentional wrongful basis for the intrusion, but its a huge threshold to overcome.
Curt Harrington Patent & Tax Law Attorney Certified Tax Specialist by the California Board of Legal Specialization PATENTAX.COM This communication is general information and not legal advice, and does not create an attorney-client relationship. This communication should not be relied upon as any type of legal advice. Please note that no attorney-client relationship exists between the sender and the recipient of this message in the absence of either (1) a signed fee contract and (2) remission of an agreed-upon retainer. Absent such an agreement and retainer, I am not engaged by you as an attorney, nor is any other member of my law firm.