Request a list of all organizations and people who have rejected any of your unsold work or are still considering any of your work. Ask to be informed of any rejections or offers that come as a result of these submissions. For work already published, the agent will continue to receive royalties on your behalf and forward statements and your share to you within 30 days of receipt. If you choose, you can ask for the return of any manuscripts in your agent's possession. Do not feel guilty.
Authors change agents regularly.
If you were experiencing many of the symptoms mentioned in the accompanying article, your agent was probably aware of the problems, too. Do not be afraid to go it alone. Having no agent is better than having the wrong agent.