My Osteo was able to help Maggie's reflux, so maybe another visit may be helpful.

What is happening with Milo sounds very similar to what I went through with Maggie at one stage. I am really trying to remember what helped her. I know the Osteo helped and I think I tried some Infants Friend. I also slept her at upright as possible for day naps. We used our highchair which has a recline position. I also fed her lying down where I could, but often she had to be tired to feed well. I did express when I thought she had not fed well to keep my supply going. We got over it, but I do remember how hard it was at the time.