As a general rule you would be entitled to proper notice IAW your states laws. An owner/LL has NO POWER TO EVICT. Only a court does.
You did not say how long it was before he could no longer handle the situation, I suppose he could argue you were a mere guest and no notice required if you were only there a day or so. However, on the circumstances as you describe, I think you have a strong argument that you are a tenant and you are entitled to full protection afforded your status (at-will/month to month)--which means 30 days written notice.
The fact that police (who usually decline to involve themselves in a civil matter like this) said you only had 7 days, tells me that there may be additional facts that you did not post. Recommend you see a local landlord tenant attorney ASAP to determine your rights under ALL the circumstances.
NOT LEGAL ADVICE. FOR EDUCATION AND INFORMATION ONLY. Mr. Rafter is licensed to practice in the Commonwealth of Virginia and the US Federal Courts in Virginia. There is no implied or actual attorney-client relationship arising from this education exchange. You should speak with an attorney licensed in your state, to whom you have provided all the facts before you take steps that may impact your legal rights. Mr. Rafter is under no obligation to answer subsequent emails or phone calls related to this matter.