Robin
I'm afraid it is standard for an assessment at the Assessment Providers offices to be required where the claimant has indicated any issues with anger or violence.
Can you get your GP to write to the AP explaining that these issues were in the past have not occurred since, you also need them to re-confirm that you need a home assessment due to your current conditions.
Failing that, you can push for a tax to take you there and back, assuming that this would allow you to attend. If not then the only thing that I can suggest is that you try contacting your MP, but you will still need to show that the anger issues are long gone.
Contacting your MP Gordon