behind schedule

Well I am behind schedule. I was supposed to run 11 miles last Friday, and it didn't happen. I didn't do a long run at all last week, and attemped one today... decided to run 9 miles and keep up with my schedule Friday and attempt 12. I think I am going to have to reassess my training once again and figure out what I need to do to get back on track. I had difficulties today - around the 6.5 mark I started getting pretty bad stomach cramps and had to stop and use the bathroom. After I used the bathroom my Ipod stopped working and I kind of felt sick everytime I attempted to run. I probably ran another mile, and walked another mile. At least I got through it - but it was a struggle. I am starting to get a little discouraged and am also starting to realize I need a serious change in my diet if I am going to be able to do this. Going to work on some research this evening and will post afterwards with updates.