don't do another tonight wait till tomorrow.
make sure you add dechlorinater to the new water,
sorry you are loosing fish,i hate it when that happens,:(
you may loose some more too,sorry to say.the ones you have
are not hardy enough to withstand the cycle process,Fishless cycle
is better,however you need to hang in there,and a couple of water changes a week,will hopefully help to keep the toxins down a little
for the fish,cycle can take between 6-8 weeks,if you could ask the local fish shop to donate a sponge or gravel that would help your
filter,do you know anyone with a fish tank ?