You missed the ten day cooling off period. The Act does not provide for 10 business days and so that means it is 10 days in total. You would not count the first day but would count the last.
It doesn't go by hours so you have to cancel by the end of the 10 days not counting the first day, that is the day you signed is not counted.
You can cancel within a year if you were not given a written contract.
You have no right to cancel otherwise.
But you can take the position that the contract should be set aside if the materially mis-represented something to you. That would also be the case if they unduly pressured you into signing.
There is no basis for cancelling a contract or having it set aside because you signed it when you were in a vulnerable state or not in a sound emotional state of mind though.
I am sorry this is not the answer you were hoping for.
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