Hi Hippo
Welcome to the forum.
Until you have the results of your biopsy you can't tell for sure what you've got. If, as you were told, your prostate is as large as a tennis ball that's much bigger than the normal size which is about the size of a walnut. This great enlargement could be caused by various prostate conditions and could be why your PSA is higher than normal.
The biopsy will shed far more light onto your condition and a treatment plan will be made on those results. It's pointless trying to forecast what that treatment plan may be.
I'm sorry you found the biopsy so painful, but again, at this stage it's impossible to tell whether the need would ever arise for you to have another.
I've had two and neither caused me anything more than a little discomfort.
I know it's difficult but try and deal with one thing at a time, otherwise you may end up being worried about things that might never happen.
Please keep us updated and best of luck mate.