Here are a few practical pointers that I have picked up along the way that are useful:
1) Dive in a 2 piece Tankini (not a bikini). The Tankini give you full bathing suit coverage and stays put while allowing you easy access when a bathroom stop is necessary. On a pitching boat at sea, having to take off your bathing suit is not convenient.
2) Don't worry about fashion or beauty.
No one cares what you look like and some guys actually prefer the "rugged outdoors type," fresh faced, no make-up.
3a) Bring a hat (even if its overcast).
No one looks georgeous with matted hair. Stick on a hat.
PLUS it offers sun protection.
3b) Use a lycra swimmer cap or scuba-do-rag (sp?) to contain hair if you need to.
3c) Putting some biodegrateable conditioner in your hair before diving willl alleviate tangles. Your fresh water rinse after diving will help the tangles, as will using conditioner before shampoo, then shampoo, and then condition again in your post dive/home shower.
4a) Don't let a boyfriend or partner (male or female) set up your gear for you.
If you can't lug it yourself and set it up, you shouldn't be diving.
Now I'm not saying that a helping hand isn't good, like when I had to walk down some slippery stairs to get to the water; it was nice to have my hubby help me get my gear down.
4b) Putting together your gear, yourself, allows you to do your mental check list and visually inspect your gear.
5) Not all weight belts work for all women. You may need a belt that doesn't slide off your hips. Try one till you find one that has some grip if you need it. You may also need to have your weight belt up higher then you think. (I had mine slung on my hips and it kept sliding down. I had to put it up higher on the hipbone to prevent slippage.)
6) As you know, most dive gear is patterned on a man's body. So don't get vain about size charts and names i.e. "L" versus "XL" or a size "6" boot versus a size "8."
Simliar to women's clothing, try on different sizes until you find a fit, THIS MAY INCLUDE several of the same size "8" boot or whatever, particularly if you need a bit narrower shoe or wider (the person sewing the boot may have move a 1/16th on an inch in one direction which may make the boot tighter or loser.)
7) As for PMS and all it's relatives
you have had good advice there (hydrating, ibuprophen). You may want to look into the "Instead" femine protection product.
Hope these pieces of practical advice help. --Starfish