Do you have one of those shower-only setups where you can only stand, or do you have a shower/bathtub combo? If the latter, you can always sit or lay down (though the latter may be tricky depending on where your shower head points) to masturbate. I play in the shower a lot, and I almost never stand up to do so. A good waterproof vibrator can also make it easier by doing some of the work for you.

There are reusable douches, some sold right here on Eden. That said, douching at any time of the month is not recommended. The vagina is a self-cleaning system that usually doesn't need any help, and even during your period forcibly flushing it out can disrupt your pH balance and wash away good bacteria. I used to douche during my period, too, but stopped when I learned that it could leave me open for yeast infections.

I strongly agree with Petite Valentine that you should perhaps try out unbleached pads (Abe's Market has a good selection), or try cloth pads (I personally think the designs at Lunapads are pretty cool). Or, if you're comfortable with the idea, look into menstrual cups. I find mine to be WAY more comfortable than any pad or tampon I've ever tried.