Our expert says:
Very difficult one and there are a number of possible explanations. I know you have had blood tests and they have shown nothing, but they don't necessarily know what to look for - there are hundreds of possible tests, so a negative test doesn't necessarily mean nothing is wrong. The classic one, which I do think you need to look at is your diet's carb content - is it possible that youa re simply not eating enough? If that happens, then you start to feel exhausted and that could explain your symptoms.
The other one is work stress. I don't think that you can underestimate this, and the fact that taking a week off training made it better does sugest that the combination of all your activities is the problem. Remember that you don't feel tired because you train, you feel tired because you train on the same day as you work, deal with life, and all it's stressed. So you have to look holistically at the situation and if work stress is particularly severe, then training must be reduced in order to cope.
So my advice is to cut back to 3 times a week, and eliminate the weight training for a week or two. Just do spinning, but if you feel tired, then don't go. Allow your body to recover, and I'm sure that in a couple of weeks, you will start to feel better. But I do have a strong suspicion that your problem is related to your work stress, and then training is the straw that breaks the camel's back.
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