I've been training for FLM (first marathon) since January, I've managed to follow the schedule and been really lucky to stay injury free. I did my scheduled 22 last Sunday in 3hrs 17 and was really pleased. I then missed Tuesdays speed session as my legs felt really sore as I probably pushed it a bit too hard during the 22, I ran as planned Weds & Thurs and felt fine. Then I woke up Friday morning feeling really rough - I threw up twice and couldn't walk more than a few steps without feeling really sick, hot, dizzy and nearly passing out. I am never ill (haven't had a day off sick in 9 years)so this was really weird for me. I am due to run 18 miles tomorrow but my Dad who is an experienced marathon runner reckons I will do myself more harm than good and I should not run at all this weekend. The thought of missing it has got me totally panic stricken and irrationally thinking it will cancel out all my hard work.
What do people think - I feel better today so by tomorrow will I be ok to run?