Big problems with tanks what do I do now.

HELP!!! I Am panicking so much. First of all I think something is wrong with my water I will test it tomorrow night after it has been 24 hours from the last water change. Well. What happened was I messed up my cycle I bought a new filter and just put it straight in as I didn't even have one. Now I don't know what to do. Harley isn't himself. He is gulping air and then he will struggle to get back down blowing bubbles to let air out until he can get down.. he's lost his gills. Almost All his feathers and what he dies have are tiny. I think his Gill stalls have also shrunk. He eats but most of the time will spit the worms out. The only good thing I can say is his tail is growing back nicely. He has recently a been moved to a tub with no filter or anything so I have been doing daily 100 percent water changes. I don't want to recycle my tank because I will have to empty it soon for my bedroom to be decorated. What does everyone advise to do? I know I've let him down.

If you didn't have a filter there is no way your tank could have been cycled. I would blame his condition on that, not the new filter. Continue doing 100% water changes and perhaps give him a tea bath.
Move the tank and let it cycle while your room is being decorated.