Someone with some polyphasic experience (uberman) commenting here...
First of all, espika - you're either going to do it or you're not. I see way too many polyphasic threads where people do it for a few days and give up. A week or a month later they try again and give up. Rinse and repeat endlessly for months or years on end. If you're not going to make it past the first few days - you're not going to make it to the end of adaption. The first few days are fucking heaven compared to the second week. What I am trying to say here is that you need to gather up the conviction to carry your resolution out to the end, or else you will never get there. Basically: Do or do not. There is no try.
The first few days of my adaption, sleep deprivation was causing me to get overwhelmingly motion sick that I couldn't keep food down. It passes, but it helps to eat smaller quantities of food, more often.
What are you trying to achieve? About a month ago, I was happily an Everyman sleeper, until my nap times started shifting around on their own because I wasn't keeping them in check. Suddenly, I was sleeping no more than two/three hours twice a day, all during different times of the day. Even though this schedule had come about naturally to me, the lack of a sleep schedule (ie: definitive times to sleep/wake) sent my body into chaos. I can't speak for everyone, but I have definitely felt the need for a strict sleeping schedule, especially when you're a polyphasic sleeper. When I was doing uberman, my biological clock knew exactly (down to the minute) when those naps where coming. I would be awake and alert at one instant, and then, about 5 minutes before my scheduled nap, I would hit a brick wall. Having a strict napping schedule will greatly aid your body in falling asleep during the right times, and help prevent from being tired all day.
Lastly, you seem to have a lot of other issues that are preventing you from adapting to a polyphasic schedule. You need to fix these (or find alternative solutions) before you can continue, or else they will serve as a crutch. Anything sounds like a good excuse for giving up when you haven't slept for a week.