How long ago did you notice these symptoms, and what was your workload like (miles, hours per week, etc) before and after the fatigue?
The backstory is that I was injured on and off from about July 2013-June 2014 (high hamstring tear, plantar fasciitis). Prior to that time I had trained successfully for several years, and normally held about 65 MPW when not marathon training; peaking at 80 during marathon training.
During that time, I had some weeks that were just very light swimming with a pull buoy, and other weeks that were a mix of swimming and running. At one point in early 2014, I was good enough to start marathon training (weekly mileage was 16/24/20/26/38/45/52/58, and then PF erupted again) Once I got that fixed, I was averaging about 40 miles per week in May and about 50 MPW in June (with variation in weeks). In June/July I also added in some speedwork. In July I started marathon training, and built up mileage from the 60s to the 70s to the 80s, with a cutback every 3 weeks. Speedwork was included in this each week, though I did skip some workouts if I was feeling really beaten up. All throughout the cycle, I had hard days and easy days, and I took every Monday off except for a gentle yoga class and foam rolling. Also did about 2000-6000 yards of easy swimming/drills split as 2-3 sessions during the week.
I felt tired throughout the build-up, though I excused that as due to the build-up. I struggled with many of the speed workouts throughout, but attributed that to being out of shape, low ferritin (which I did manage to get back up), summer humidity, and allergies. I have horrible fall allergies, and so having a constant headache and underperforming in races each fall is a norm for me - usually it turns around with first frost.
The sleeping problems and the high elevated HR and the irritability really showed up starting in mid-September. They weren’t consistent - I’d note them, cut back for a few days, and then things would improve and I’d go back at it. Quads felt like they would be about to fail me at the end of workouts, but I just dealt with it. By October, the sleeping problems and elevated HR were more consistent (about 5BPM), but it was also cooler, and I managed to pull out a few good workouts. And I’d still have some good days, sleep and RHR-wise. I was still pretty irritable at work, but I excused it as justified irritability (work is annoying for us all, right?).
In November, I tapered for the marathon - RHR and sleep improved some and then worsened again, and I had a bad bit of indigestion and elevated HR in the last days before the marathon, plus insomnia. I attributed that to race nerves. Felt a bit shaky on the start line, but thought it was race nerves. Ended up doing a 10 minute positive split on the marathon - my quads started hurting at 10 - I hung on till about 18-20 ish and then they spasmed on me completely. Finished the race out of a combination of stubbornness and the knowledge that if I finished I at least had a BQ if I ever needed to use it (it’s nice to be female and 40).
I’m pretty beaten up now - my RHR is elevated (though falling a bit each day) and I’m still having sleep trouble and the sense of being unable to “turn off”, if that makes sense. I’m sure a lot of it is the race itself, and I also wonder if I didn’t pick up a minor stomach bug during the last week of taper. But all the warning signs during the fall, which were a bit consistent with the race crash itself, lead me to believe that I need to worry about recovery this time even more seriously than I normally would after a marathon. I really miss training and want to get back into it, but I also think that I’ve been hit over the head with a warning sign, and better pay attention this time.