I feel you. This is making things hard in so many ways. I suggest packing a really hearty snack (boiled egg, cheese and an ounce of almonds) to eat before leaving work or on the way home if you can do so safely. Then prep and prepare meals you can heat and eat when you get home. The snack will have been eaten early enough that maybe you wont be as hungry. And of you are not eating breakfast then do so. Fuel yourself before you go in. Finally, I know water is good (I drink about 80+ ounces a day easy) but if you are doing a demanding physical job, take two gaterade zeros with you too. The electrolytes may help with your muscle load and will replace your salts. ALso as you said, the muscles are holding water so the scale is tricky now, but the added muscle will eventually let go and it will raise your metabolism too. Hang in there-- you will find the right balance just don't give up.