relax. *hugz* otherwise the milk can't flow when you express it
before i went back to work, i started freezing milk. it's a lot of work, you must be mentally and physically prepared.
i will drink anmum, papaya soup and pig trotters soup (helps to increase my supply slightly ). also, eat whenever i feel just the slightest hunger pang. all these will help in ensuring the body has enuff energy to sustain daily activities and also milk production.
after every feed, i will pump until the breast is 'empty'. i will store all the milk in the fridge. when i knew dear son was not going to wake up for feed (sometimes, he just sleeps thru for 4 hours straight), i also pumped the milk and store in the fridge (maintain the supply). when it's time for feeding, i will mix the milk (both of same temp). eg. stored 2 bottles of 50ml in the fridge, dear son drinks 60 ml for 1 feed. i will top up one of the bottles to 60ml and feed dear son.
gradually (depending on supply), once i built up sufficient in the fridge, i moved on to storing excess milk in the freezer (using milk bags).
if you are freezing milk, once you freeze it, cannot thaw it and add in more milk and re-freeze. if you are concerned about wastage of the milk bags, you can collect the milk in the fridge, then mix one shot into 1 bag and freeze it.
once you thaw it to feed baby, you can mix it with new expressed milk (top up the quantity, etc) just before the feed.
hope this helps. Jiayou