need advice about after cataract surgery

Hi' Everyone,
I am new to this group, but I hope someone will be able to give me some
advice.
I had a cataract extraction and lens implant just over two weeks ago and I
was told to take the lens out of my multi focal glasses, the doctor didn't
tell me it was his assistant. However, this felt really weird. I rang back
and she said cover the frame with something like a tissue and just use the
other eye.
I'm worried that the eye that I had done will become lazy, I'm just
guessing. Also, the eye I'm using is feeling very strained.
Would someone be able to tell me if it is okay to just use the old lens
(that I took out). I don't see the doctor till the 14th December and I'm
getting worried.
Also, should I be seeing things really well yet. My eye sight has been bad
for years, long lighted, and I know that having the cataract removed doesn't
improve that, but I still seem to have some cloudiness there.
Any advice appreciated.
Joan.