4th run was bad. 11 miles in 1:38:45 but I recuperated very well despite running very hard.
5th today was 11 miles in 1:35:55 on the harder hillier (BR) course.

Also started eating chocolate again a few days back and have not had a headache. I think eating chips (the preservatives in them...??) made me more susceptible and then all kinds of things put me over the edge. Now I can drink alcohol, cheese and chocolate even without issue.