I'm on 6 lpm and have become lazy. I'm always sleepy too.so if I'm not on my pc I'm sleep in my lay back computer chair. It's frustrating to go anywhere with such a big tank and usually takes 2 tanks to go to the dr.s..which is hardly never, most of my visits are done on my pc.I have poor circulation in my legs/feet which means they're constantly swollen. Even with elevating them. I used to walk 15min. every night plus pedal my stationary bike 15min. occasionally I'd use the bans on my arms too. there was a bout where I stayed sick, one exasperation after another/asthma attacks . constantly on antibiotics. Just got back right (o2 levels 89-93%) need to get back to the exercising just lazy. Can't seem to shake it.any suggestions?