Our expert says:
I think you have a dual problem of not being completely over the infection and treatment, as well as the lost training. 3 weeks is not that long, and you won't have lost all your fitness. You just need to discipline your mind more than anything else so that you don't expect to return to the same level as before. That's the cause of your discomfort.
But you need to be more patient, because you have just come back from what was obviously a pretty serious illness, and the body will take time to get over that anyway, regardless of fitness. So I suggest that you give it a week where you train at 30% of your normal intensity, and then take the next 2 weeks to build up, first up to 60% then 80% and then you'll be back to normal.
But it will come, just take your time, and don't expect your body to slot right back into the point where you left off.
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