Okay so I've had this umbrella plant for a few years now. I'm being honest, I've not taken the best care of it, as I hardly use fertilizers etc, but it's survived. It's my favorite house plant and I don't want it to die.

I was away for a few weeks, and when I returned I found out that someone had placed the plant outside and it had lost all but a few of it's leaves. It had started to regrow it, and I immediately brought it back inside, and its starting to regrow loads of tiny leaves on its stem. But the new leaves keep shriveling up and dying. It now has an aphid problem also.

Is there anyway I can stop the leaves from dying? Also what is the best things to use to get rid of the aphids? (I tried looking for ladybirds today, but couldn't find any :/ )

I did use a bit of this "all purpose" water soluble fertilizer I found in the garage. It was like blue crystals, and who knows how old it was.

So yeah, help please

Pics can be provided tomorrow if needed