Okay - was the new PSA test done at the same time or just after the biopsy? If so, much of the rise could be down to that. It is too early for the PSA to be sinking rapidly with the hormone treatment - HT needs a bit longer to work because it starves the cancer rather than killing it.
I don't think you are at the stage of straw clutching yet - as said above, try to do happy things and put the guessing to one side for a little while. After your next appointment you will have a clearer idea of what is happening.