I was sick a few weeks ago & was taking some Tylenol Cold medicine (as my doctor told me it was safe) & nursing also. Since then, my supply isn't what it used to be. I used to be able to pump 3-4oz per side, now I only get 1oz, if even that. I really need my supply to come back up as I need to start pumping due to starting classes soon. Any tips on how to increase supply?