Need help with my Giant Gourami

[blissful_sky]

I have a Giant Gourami and it appears that she has flukes. I've had her for about 4-5 months and always change her tank 2-3 times a week the max. She has a great filtration system though one day I noticed she was leaning towards the side a little bit and decided to test her water.
Her nitrites were very high! I quickly changed her water and added salt. Though those few days she leaned more and more to the side and just spent all of her time at the bottom of the tank. Then she started banging against the glass sometimes then I knew it was getting serious. Since the weather where I live changes at the drop of a hat I decided to add a heater and raised her temp to 76-78. Then the "flashing" or banging against the glass got worse and now she refuses to eat. She isn't leaning on her side as much as she used too but there seems to be like a geletin on her eyes...almost as if it was a dusty contact.
I believe she has flukes and bought Fluke- Tabs but wanted to ask MFK before I did anything.
Sorry if it is so long, I just want to make sure my great fish makes it through this. Since she means a lot to me.

Thanks.

 

[S13biker_808]

is her gills red? any signs of bleeding? could be ammonia poisining, the ph could be off. internal parasites. check the ammonia and ph first

 

[blissful_sky]

Her gills are very dark, almost purple actually.
I put in fluke tabs last night and the tank seems to be littered with what looks like dandruff. Though she is still very weak.
I thought it was ammonia poisoning at first though when I checked the water..her ammonia was at 0.
On her pectoral fin there seems to be a bit of bleeding..Not where the fin connects to her body but a little higher from that point. Sorry if that was confusing.