Increase milk supply

How can I increase my milk supply? My boobs feel engorged and sore but when I pump I barely get anything. I’m afraid my milk is drying up and I’m discouraged. My son is 1 month old and I had to supplement with formula because my nipples were inverted and he wouldn’t latch. I feel so guilty for not breastfeeding and on top of that barely producing enough milk. If my milk supply is stopping is there any way or getting it back? The first week home from the hospital I was under so much stress and anxiety I wasn’t eating and I feel like that also caused my low milk supply 🥺