On Wednesday I went from desperation to elation in a matter of hours. I called the O2 company to ask when they would deliver the portable concentrator. First, I learned that it goes up to 5L/minute, not 1L as I had thought. That was great news. But then the rep told me that the portable delivers O2 in pulses and you have to inhale deeply through your nose; it won't deliver O2 on a normal inhale. And it doesn't have a continuous flow option (e.g., for sleeping). So that made it seem like the portable wouldn't be helpful for walking and going on overnight trips. I was crushed. It got worse: when I asked to order more oxygen tanks, I was told that if I have a portable, I can no longer order tanks. Insurance will cover one or the other, not both. I can have 2 tanks as an emergency backup. That's it. In fact, if I decided to return the portable, my pulmonologist would have to write a new prescription for O2 tanks. I called Leland in a panic, unsure what to do. When I return...