I've been running for a long time and recently I started getting headaches after hard runs and feeling lightheaded, times have been going up a lot and feeling very weak on runs with times that I shouldn't feel weak on
One possible thing is that I could have a virus that I contracted last Friday but it is still going on (today is next Sunday)
Friday night I felt very nauseous and weak with a headache all of sudden but it went away the next day (probably virus) but wouldn't I have recovered by that by now?
Could this just be effects of the brief virus or something else?
Btw my iron levels are good