Vitamin deficiency, "jet" lag (actually caused by any long distance travel), and Vicodin are the likely suspects here.
I also had G.B. surgery, and have been anemic ever since. Supplements are important, but for those post surgery they must be tailored to specific needs. (Decreased absorption capabilities must be factored into supplement choices) http://www.bbvitamins.com/education.aspx explains the issue and inetervention for vit deficiency.
To read about fatigue and circadian rhythm disruption in long distance travel Go to: http://sportsci.org/encyc/jetlag/jetlag.html
Vicodin is an opiate and known for causing CNS depressive effects. For those who take it long term for chronic injury the fatigue and drowsiness side effect may decrease. However, the strain on the liver from both the opiate and the acetaminophen frequently causes a chronic feeling of fatigue or exhaustion.
Call your doctor in the morning. He may want to test your blood count and thyroid.
Drink as much water as you can tolerate
Shift your nutritional intake by increasing lean protein and limiting simple carbs, especially sugar.
Exercise daily
Eight hours sleep is healthy, but studies show the hours of sleep before midnight are important as well.(10pm-6am is more restorative than 1am-9am)
Add recommended supplements
Consider finding an alternative to vicodin
Go to http://www.emedicinehealth.com/fatigue/page4_em.htm for information on the point at which fatigue reqires medical intervention.
If these changes do not improve fatigue a complete physical exam is necessary.
Good luck, I hope this helps.
__________________
I hope my information is helpful. If you have more questions, just ask! I will gladly help, otherwise please click "accept".
Positive feedback and any bonus would be appreciated. Thank you, Christy
