That sounds familiar to me. That feeling of exhaustion, where you’re not sure if you can even walk home and all you want to do is go straight to bed. Once you’re home, everything feels better again, even if some time has passed by then.
I’ve no idea what’s causing it, but a diet could be one reason (the body flushing out toxins), as could your asthma. Changes in the seasons and temperatures can also have an effect.
Perhaps it would be a good idea to get more rest and sleep?

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