10 days into flower with a big problem

I had a plant growing for 3 months outdoors i live live in the northeast so it got to cold to keep it outside, i brought it inside and it bascily had no light for 2 days, i finally built a grow room and i put it in there, but on the veins of the bigg fan leaves there are brown spots and i think it is moveing up the plant, beacuse when i cut the bad leaves, now i look and the set above is starting to look the same , what should i do please. Also i saw a wierd looking bug, it was like clear white color and it had wings, it was very very small, how do i save my plant plz!

IT also kind of looks like this http://media.photobucket.com/image/brown%20spots%20on%20leaves/morphirr/Davids/Rust3.jpg not my plant though but it looks like this

When moving any plant indoors, insects are the first thing I deal with. The "new" climate often means infestation. It's not a one-time fix.
I doubt bugs are you're only issue, but can't guess w/o a pic.