Rapid muscle gain for newbies can last for several months especially over weight newbies. In the case of a female though - rapid muscle gain is maybe 1 lb a month - depending on genetics. So ... who knows.

As for the 7x weight - never heard it either but I have heard 9x weight. So again ... who knows.

I would just continue doing what you're doing. I'm confident that you will start seeing losses over time.

F.

Just wanted to let you know, it took me over a month to begin to see changes in my weight. I'm still going a little slow, but I do feel it's forever. Keep up the good work and give it a little time!

Some people pack on weight super fast and lose it super fast.

When you say you have some higher days, maybe thats actually destroying more than you think. Keep a very strict diet, record every single thing you put into your body and don't go over the max - its a simple game of maths.
And your trainer may be right; trainers are an excellent way to push you because oftentimes, they know your limits. Just because you're a little uncomfortable during a work out, it doesn't mean you're at your full potential.

I agree with John.
Stick with it and see if a whoosh comes, and maybe add more exercise if you can fit it in.