Hi GD - that's a lot of activity your doing. Great job! There are so many factors to consider when trying to answer your question. Your micronutrient intake (carbs, protein and fat), your height, your weight, your fitness level, your body composition, etc. There may not be a quick answer. First off, I'm not a professional. However, having headaches every morning for years in my non-professional opinion is not normal. I would suggest you see a doctor, but in the case that you can't or won't, trying upping your calories to see if it helps. Ensure you are eating quality food, staying hydrated and getting at least 8hours of zzz's per night.
If you could post more details, maybe others would chime in with more suggestions.
"Some quit due to slow progress. Never grasping the fact that slow progress....is still progress"
Restart Weight (02/Jan/15) - 145.6 lbs
Current Weight (27/Feb/15) - 141.4 lbs.
1st Goal (to get out of an 'overweight' BMI)- 136 lbs.
Easter Challenge Goal - 129 lbs.
Distance Challenge - 60.7/150 miles by Easter