No energy whatsoever

I hate to ask but is your period coming? I have very low energy and feel tired all the time several days before my period shows up. Either way, even if it's not coming, don't stop altogether. Try doing something, anything so that your body doesn't get used to being sedentary. When I feel tired and don't want to do anything, I don't force myself to work hard, I just go light. I'll walk really slow on my treadmill or take my dogs for a short walk.

Are you eating back your exercise here is why you should

http://www.myfitnesspal.com/topics/show/539912-why-eating-exercise-calories-is-so-important

Here is a guide for setting weekly deficits, and on top of this when you workout you should eat those calories back. So if you are on 1200 cals and burn 300, you should eat 1500 for the day.

If you have 75+ lbs to lose 2 lbs/week is ideal,
If you have 40-75 lbs to lose 1.5 lbs/week is ideal,
If you have 25-40 lbs to lose 1 lbs/week is ideal,
If you have 15 -25 lbs to lose 0.5 to 1.0 lbs/week is ideal, and
If you have less than 15 lbs to lose 0.5 lbs/week is ideal.

Try opening your diary. For me personally, the lack of energy is usually because of (a) Lack of rest or (b) Not eating properly. Are you eating too much of the greesy stuff? Are you eating too little?

Second this. When I used to have low energy levels I realized I just wasn't eating enough. I wasn't hungry either so it was hard to tell.

Thyroid, adrenal fatigue, anemia, so many medical reasons for this - I would suggest seeking medical advice.

I usually have no energy at all, and this has been going on for almost a 2 years. I recently changed my supplements and upped a few and have noticed some changes. I also made sure not to eat late or go to sleep starving.

I increased my B-12 from 10mcg to 500mcg, my Vitamin A from 3,500UI to 10kUI and my Vitamin C from 60UI to 250UI. I also go to the gym 4 to 5 days a week. I personally have had more energy in my day for when I work out and through out my work day, I even go to bed earlier and wake up pretty refreshed and usually before my alarm clock.

My breakfast is actually my biggest meal of the day ( calories and fats ), followed by my lunch and than my dinner. I make sure to eat dinner before 8pm most nights and usually fall asleep around 10ish.

So far for the past few weeks this change has worked, I even purchased a Nike+FuelBand and it's given me some extra encouragement. I also make sure to input my daily foods and exercise I've done on MFP.

I would see a Nutritionist if your food plan is off, I know mine was. Since you workout, do you go to the Gym, if so I would see if you can find a trainer that knows what ways to help boost your energy levels. When you workout have you tried to workout in the morning and not late in the day, maybe change when you do this may help. When you workout did you also have a full meal, I know when I tried working out after having breakfast, my energy can be kind of funky. I usually just snack on a fiberone bar and drink a propel energy drink.