Not sure why people think you need to own a helicopter to make it worthwhile to learn. As Whirlybird says, it's perfectly easy to rent one when you want; but obviously fewer places to do so compared to fixed-wing.
As to the training - you may well take a bit longer to solo in a heli, but overall the time would be similar to FW. I used to get very tired too after lessons, but it gets easier as you start to do more things subconsciously.