I do wear bifocals, but think they look alike enough to bring it to your attention. With the plant there in person, you would be in the best position to make the call. Seems to be a consensus yours is some kind of Hedera, which has tons of species and cultivars. If you only looked at the top pic of the database entry, of a plant that has reached maturity, I can see where you saw no resemblance. Like many vines, Hederas wildly change their appearance if/when they reach maturity. That's unlike to happen to a potted plant.
Sorry it's not going well. Your experience is like that of so many others who bring various kinds of Hedera inside.
Different plants like different conditions. There are some that I have given up on because they can't stay healthy in the conditions I have to offer, but the ones that do like those conditions do well.
