There are a LOT of things that can contribute to/influence PMS and the severity. What is your diet like? A lot of PMS problems can be fixed through diet, and eating really well especially in the two weeks before your moon. The B vitamins are essential, esp. B6. Eliminate sugar and all refined foods, focus on high quality protein, complex carbohydrates, fresh veggies, antioxidant-rich foods. I've read that members of the cabbage family can contribute to exogenous estrogen, which worsens PMS. Other sources of exogenous estrogen should be avoided, too, like conventional meats and dairy products and soy, at least in the week or two before your moon. (IMO, these should be avoided all the time, but lifestyle and diet choices differ...)
Like the PP said, exercise is really important, too. I know it's hard to find time and energy sometimes, but personally I find that I feel 100x better when I am PMSing and I go for a run or even a short walk. Don't underestimate the power of moving your body!
I have found a lot of relief drinking lemon balm, skullcap and nettle tea before my moon. They are very nutritive, and lemonbalm and skullcap are excellent, soothing nervines (skullcap is especially useful when you are feeling anxiety and rage). A cup of chamomile tea also never fails to mellow me out a bit.
I am working on reducing my PMS, too. Personally, I think my PMS problem is the combination of a lot of other things gone awry with my system. LIver weakness and digestive troubles, namely. THe liver plays a really important role in production and regulation of hormones, and if you're liver is stressed or weakened in anyway, chances are your hormones will start getting wacky. SO, I'd also recommend focusing on building the health of your liver and endocrine system, through diet and herbs like burdock, dandelion, yellow dock, milk thistle, astragalus and licorice.
If you are short on time or don't want to make your own herbal tea blends, Traditional Medicinals has some really good teas. Their women's liberty would be helpful and I think they have some for PMS and moontime.
It sounds like you are a very busy mama, but if it's at all possible, do try to take at least a little bit of time to be totally alone during your moon. That has been one of the most helpful things for me.