Hello and welcome to the NeuroTalk Support Groups.

There is a very brief PubMed
abstract I've posted at the bottom that mentions 2 cases of transient anosmia and ECT.
There may be more if you do a search for abstracts there or find full articles online.
I would imagine that if it could cause anosmia in some people (although rarely by the look of it),
then it may also alter smell.

You should ask your doctor about this. Hopefully this will go away fast for you.

http://www.ncbi.nlm.nih.gov/pubmed/24263277
Transient anosmia during acute phase electroconvulsive therapy: a report of 2 cases.

J ECT. 2013 Dec;29(4):e55-6. doi: 10.1097/YCT.0b013e31829a01b2.
Upshaw WN1, Hubbard JD, Ali S, Fernandez JW.