LOL! Sorry, but an attorney claiming you are "ethically obligated" to negotiate with an attorney without consulting one of your own - well, that just cracked me up this morning.
Is there any way that you can log into the website of your phone provider and access a copy of your texts online? That would make it loads easier to print a copy. If you can't find that on their site, call them and ask?
I hope your nerves steady. Definitely want to get something to eat. The meeting is going to be stressful enough knowing at least one person in the room is going to be arguing for argument sake (trademark of many attorneys who just need to 'win' at all costs) - don't deprive yourself of nutrients going into this. That will just compound the mental stress with physical. Maybe some chamomile tea to relax the mind so you can eat?