Do you have the actual numbers for the tests? That would help.
It would be strange that nitrates would be high after 1 week, especially if ammonia is reading high. Have you read any articles yet on cycling and the nitrogen cycle? That would be a good start.
If ammonia a/o nitrite is testing at 0.5ppm or above, you need to perform a 50%+ pwc
. While the tank is cycling you will probably need to do this at least once a day if you want the fish to survive. It sounds as if the ammonia is already impacting their health based on your description. The one swimming sideways probably won't be alive much longer I am afraid.