So frustrated. Ortho wants me to get 'invisable' braces instead of Invisalign. My teeth are not super bad!

Obviously I don't know what your teeth look like, but invisalign is surprisingly very good with all sorts of orthodontic problems. I have overlapping teeth, horrible overbite, and a large 5mm gap between my front teeth and my orthodontist, who does research with invisalign and is very skilled with the treatment, found it to be no issue and said I could proceed with invisalign. I was very skeptical because many had denied me invisalign treatment already, so she showed me a few of her invisalign cases and I was shocked. She explained to me that invisalign isn't taught in dental schools and all orthodontists need to offer it is a certificate they get after a short course offered by the company or something like that. So in the hands of an unskilled orthodontist, they're useless. I would recommend you find an invisalign premier provider and got their opinion.

I had braces 12 years ago and the ones used on my top arch were clear, not metal. The only thing that was made of metal was the super thin wire that went through the middle of the braces brackets. I had to have metal braces on my bottom arch because I had an overbite, and the clear braces were more fragile than the metal ones. If I recall correctly the clear braces are made of cement. They didn't stain or discolor during treatment, but the bands that went around the brackets would discolor or stain if I drank or ate dark colored stuff like pop or tea.

I am so sorry to hear how frustrated you are. :-( I think you are doing the exactly right thing by seeking out a second opinion. It might not be a bad idea to even get a third, hopefully with the third you will hear some commonality between the advised treatment, and get a better feel for realistic options for your treatment, whether that is Invisalign or clear braces. 

Please keep us posted what you find out at your next consult!