All good points !
SIE, you will want to refrain from using chemicals in your water for a reason that hasn't yet been brought up yet and I wanted to interject.
Chemical additives may "fix" a problem temporarily, but almost always will cause other problems by wreaking further havoc on your water chemistry. You may add the chemicals a few times and then find that you have a voraceous algae outbreak for instance.
One mistake that newbies/beginners make over and over again (and I did this myself, so I know !) is that they look for ways to short-cut or bypass altogether the cycling process. Impossible. You MUST go thru it in order to have healthy fish. The best solution for stress on fish due to ammonia/nitrIte toxicity is continuous water changes. Never underestimate the power of a water change ! It can cure SO many ailments you won't even need to think about chemicals in most cases. Strive for keeping your water as chemical-free as possible. Your fish will thank you.
Achu makes a good point about cutting back on feeding. This is a tried and true approach to cycling woes. There is also nothing wrong with vacuuming the substrate, feel free to vacuum away ! The harmful bacterial growth that results from accumulation of waste in the water will do greater harm to your fish than vacuuming it.
You can easily increase your water changes to 40-50%, every day or even every other day. Your nitrIte levels will fall on their own ... you just have to let nature take its course. It WILL happen.
I'm moving this thread over to the Newbie forum so that we can stay in touch with your situation and so that your thread doesn't get lost in the more advanced-type questions.