After the "first run since october" a few weeks ago I have kept running 3 days per week, as I am entering a 10km race in May. In all the jogs since I first started C25K I have never experienced much disconfort other than a bit of thirst or heat or maybe some muscle pain. But last saturday I went off for my morning jog and after a while I started feeling nauseated to the point I didn't even manage 5km and walked the rest of the way back home. Apparently I wasn't looking very well and the nausea feeling only went after some rest and beroca. This week I managed to reach 6.5km after than incident, but am quite puzzled as this has never happend before. Anyone experienced the same?