You gotta use your imagination, too. Thinking of something that turns you on while your touching yourself, etc. Does wonders.
I've heard that the shower head is suppose to work really well, but it needs to be the one with different settings. I haven't been to the store to get one yet, so I wouldn't know. But, I know that a regular showerhead doesn't work on me, lol.
I'm able to achieve an orgasm using my imagination and rubbing up against a pillow. So, just experiment a little bit and see what works best for you. Good luck!