How do I prevent neck and back pain, and recover physically/mentally on a multi-day ride? I'm nervous about the ride and looking for some motivation, support and answers to a couple of questions.  I'm a 53 year old female and I've done 75, 80 and 100 miles before but never a two day ride for a total of 180 miles.  I've put quite a few hours in on my bike but I'm getting nervous now.  I know I can do the first day but I'm concerned about the second day and how I will feel.  I tend to feel a lot of burning across my shoulders and neck after about 50 or 60 miles.  Question 1: What can I do to prevent this?  Also, what should I eat the night before the ride and is there anything I can do to prepare myself mentally and physically after the first day?  Can I do this?  I won't back out now............I told my family I was crossing the finish line even if someone has to drag me across.  Please help!  I'm not even sure I can sleep tonight!
Don't be afraid to get off the bike.  Take a break every hour or so. Shake out your legs, shake out your arms.  Stetch your muscles.  When on the bike, try to remember to switch hand positions often set a timer on your watch every 10 minutes if you have to to remind you to switch things up a bit.  

Eat before you are hungry, at regular intervals.  Don't wait until you feel hungry to start eating. It's already too late at that point.  

Don't drink too much on the night between the rides. I don't know about the ride you are going on, but a lot of these two day rides have "refreshments" available at the end of the first day. A cold beer can be nice to relax you, but don't overindulge.  You'll regret it the next day.