Jenny,
I think I can understand how you feel because my own hearing loss has also progressed from moderate into profound-to-total level and the last drop was detected quite recently. Congratulations on making the decision to use hearing aids again to make the most from the hearing you have. Be prepared to work a bit to get accustomed to them when they arrive, and this effort will be more than rewarding.
Your parents needn't sue your doctors, since wearing HAs cannot stop or postpone the onset of further hearing loss (as in my case). But you still have quite a lot of hearing left and chances are good that you will cope well with your new HAs and FM system. I would also suggest having a note-taker to assist you at school and university, if possible; try and find out if such an option is available for HOH students where you are.
Concerning the possibility of CI, I find it absolutely normal that you do not want to consider this option at the moment - at least, when my hearing was as good as yours I wouldn't even let this thought linger. However, it may be heart-warming to think that there is always a way out in case things get really tough - but I hope they never will
Good luck!