Hi debslosjoe
Once you have applied for UC there is no going back. As you applied for UC then you will not get any transitional protection unless you received a letter from DWP inviting you to apply.
We would advise you to seek help from your local Welfare Rights Organisation who will give you advice for free.
UC does not help with council tax, you have to contact your local council and apply for Council tax support.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems