I'm wondering about Lyme disease and chronic fatigue syndrome — the differences and similarities?

If you step on a nail and have not had a tetanus shot in the last five years, how soon should a person be vaccinated? 24 hours? 48 hours?

I use Nalgene bottles for about 75 percent of the water I drink each day. Therefore, I was startled to find out that there is some possibility that these bottles leach chemicals into the water. I've found conflicting opinions about the veracity of these claims on the Internet. What's the truth? Should I dump my Nalgene for glass? You have an earlier post about bottled water, but it doesn't seem to address this issue specifically, and you recommend purchasing reusable bottles like the ones that might be poisoning me. The bottles I use have #7 on the bottom in the recycle symbol.

After a night out with friends, I stopped in a nearby cafe before heading home to use the restroom. Unbeknownst to me, the staff had just mopped the restroom with bleach. Usually, a clean bathroom is a welcome amenity, but this one in particular is very small (barely a water closet) with zero ventilation. Though I was in there a brief time, my eyes and nose began to burn and water, and I could not very well open the door until it was time to wash my hands. It's been well over an hour since I inhaled all that bleach, and my eyes, nose, throat, and lungs all burn. I can't taste anything, and all I can smell is bleach. My head also hurts. I've gotten a lot of fresh air and plan to go back outside shortly, but these side effects have yet to abate. Am I in danger of respiratory damage? Is there anything specific to this situation I can do to alleviate the pain and discomfort?

Thanks for your help.

I am the front man for a heavy metal band that is steadily growing in popularity. During shows, the whole band head bangs, but I seem to go a little bit harder than everyone else. Every morning after a show, I wake up with stiffness, soreness, and slight swelling of my neck and upper shoulders. Lately, I have been thinking that maybe thrashing my head around as if it isn't connected to my body is a bad idea.

My question is this: Does head banging cause any permanent injury that I should be concerned with? If so, how could I head bang differently to lessen the injury?

I have a friend who will be going through chemotherapy and radiation. What can she do to build herself up to keep her body in the best condition possible?

I have dandruff that responds well to over-the-counter shampoo. Ergo, I have been using the stuff almost exclusively for ten years. No brand in particular, sometimes zinc pyrithione (the blue stuff!), sometimes coal tar (the smelly brown stuff!). Anytime I switch to non-dandruff shampoo for like three to four days straight, I get my dandruff back. I worry that I might be addicted to dandruff shampoo. Should I worry?

I was wondering if people can die from not going pee. How long can a person go without peeing and, if they cross that line, then what will happen? Also, can you get a blood infection from ignoring a bladder infection?

I want to know if you are able to have anal sex when you have hemorrhoids, and if there is a way that it will only hurt as much as it does to have sex that way without them. And if so, how can I reduce the pain?