Expressing advice

Lisa

So my son is nearly 5 weeks old now and initially I tried breast feeding him but his latch wasn’t great and then he decided to stop latching all together. After a week I decided to start combination feeding with expressed milk. Anyway long story short it became so time consuming and it felt like alls I was doing is feeding or expressing so I stopped after a few days. Fast forward 4 weeks I still have milk and my son is ready struggling with reflux. Is there any way I can get my supply back to try and start expressing again to help prevent his reflux?