I used to get bladder infections every month for about two years too, and it's a dreadful infection, makes you feel horrible. I'm sorry to hear you're going through this.
In my case, wearing skirts or sweats helped so it didn't squeeze me down there. Cranberry (you can find it in pills also) helps.
Washing yourself with cool water and warm water for five minutes around the area can help a little. Products like vagisil feminine wash can keep the area clean so it helps keep bacteria from getting into the bladder area.
In my case my bladder became infected from having irritable bowel problems, and my intestine irritated the entire regioin, including my bladder. So, in case you have tummy pains too, you might want to get that checked out.