mystery fatigue problem any ideas?

Maybe a blood test, it can analyze other things besides an iron deficiency.

you are in college. you have health insurance and potentially a student health center. go to them with your issues.

It could very well be iron deficiency--there's been many runners on my team who've struggled, didn't know what was wrong despite consistent training, but got tested and had low ferritin levels. Make sure you specifically ask for a ferritin test, though, since doctors don't usually automatically do it. It might cost you a little more (it cost me $40), but ferritin levels are a great indicator of where you are in terms of iron. I was told that good levels should be above 30, and when you get around 20 or lower, your performance really starts to suffer. Good luck with this :-)

Sounds like a job for House.

Cancer

I seem to have the same problem every year. Anyone?

You are one of the many who don't run well once you start doing workouts. See the thread on no interval work success.

It is amazing how many people devote large portions of the year to doing runs that make them slower.

Not much you can do about it until you are done school and can get away from coaches with one dimensional thinking.

mono, iron poor blood, overtraining, etc...could be alot of things....go get a blood test like previous poster said.

or chronic vaginitis.

Sleep? What's your life like outside of running... are you excessively stressed?

i would get checked for mono ASAP, same thing happend to me.

i would get checked for mono ASAP, same thing happend to me.

depression?

Iron. Iron. Iron.

Demand a serrum ferritin test.

If your levels are under 25, you'd probably feel some effects. Under 10, and your dragging. It can happen quick (one week you feel good, then the next crap). BUT the doc may say it's normal since the normal range for couch sitting people is 10 and up.

Demand it!

You didn't provide much info about your routine so people are stabbing in the dark.

Obvious non-running ones:

Illness - you should be able to get a blood test if you go to a Doctors. That should show if you have any iron problems.

Nutrition - are you eating enough and the correct stuff to refuel? Are you drinkning too much?

Sleep - are you getting enough sleep for your body to recover?

Obvious running ones:

Base building - How much of this are you doing before you start doing sessions? It could be that you aren't doing anywhere near enough so your body cannot cope with sessions, ultimately leading to you getting more and more fatigued with each one. That might explain your good first few weeks as you respond initially before the dip.

Sessions - How many are you trying to do and how much in each seassion? You'd be better off doing 2 good sessions a week supported by good base running than 3 sessions that you have to slog yourself to the point of fatigue to do.

Perhaps it might be a combination of some of these?