Hi Michael, welcome to Quit Train! Looks like you already have a good start on your quit. Congratulations on two weeks! If you haven't already, I would suggest learning as much as you can about nicotine addiction. It really helps with mindset which is so very important in keeping quit long term.
Regarding your questions, I am familiar with the insomnia withdrawal symptom but not the breathing issue. You might want to get that one checked out. The insomnia should go away in time.
Best wishes to you for long term success!!
