Yes you can have chemo more than once and if docetaxel isn't effective, they may offer you cabazitaxel instead. But you are a young man and if not already done so, it is time to get a referral to nacnillan or your local hospice to start planning end of life stuff ... better to do it now than when you are actually at end of life. The hospice team will have people who can help you plan things like where you want to be, they are usually far better than the hospital or GP at managing pain and will know how to get any equipment you might need as things progress. The appointment on 4th is also the time to start talking about finances - if the onco has a reasonable belief that you may have less than 6 months to live, they can complete a form which gets you financial help. 6 months sounds brutal but many oncos or specialist nurses will sign it if they think you have less than 12 months. This benefit is very important as it will help you pay for any specialist equipment, home assistance, waking night staff, etc