Brain fog and sleepiness at 22 weeks

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I was feeling great a couple of weeks ago and bragging about all the energy I had but these last few days I’m dragging my self around. I feel I can’t focus at work and can’t get anything done 😔 I just want to sleep! I took a walk and I have been drinking water but I still feel the same and I feel guilty. I know this is not my usual self and I’m a hard working woman, I guess I just wish I could enjoy this lazy feeling more you know?