Hothouse plant - help

I have an evergreen plant from Spain called 'Diplodenia'.  It has flowered outside for 7 months and now that its colder,  I've had to bring it inside - the room is heated and therefore fairly dry.

The plant has been inside for about a month and now the leaves have lost their glosssiness and many are turning yellow.   I have not been feeding it and have been watering it once a week.

Can anybody help please ?

Thanks.

Chris