Pumping at work ..

Alright so ever since I started working, my supply has went waaayyyy down. At home I was about to pump 10oz per session and today I barely pumped 2 😞 and when I’m close to my period its even worse. He eats directly from me when I’m home and I only pump when I’m at work for 10hrs. I’ve tried taking supplements that are supposed to help increase your supply, eating foods that are supposed to help, I drink at least 100oz of water a day and I’ve power pumped and nothing is helping !! My little guy is only 5 months old and I’m not ready to stop 😭😭 please give me anything and every tip that has worked for you. I just want to be able to make enough for my baby 😢