I think my 4 week old has acid reflux. She spits up during every feeding and at least once a day she projectile vomits almost an entire 3oz bottle. When we switched to formula I started her on supplementing formula to ease into it from bfing. Then after about 3 days we switched to the AR because of her spitting up. She's a lazy eater and it would take forever for her to eat but she wasn't spitting up any more. When we went to her dr appt. the dr wanted us to take her off of it and use a low iron formula, which I couldn't find. So I switched her to Gentleease. She did ok on that for a couple of days and then she started spitting up again. (I'm burping every ounce or less and feeding her in an up right position) I called the dr. To ask what I should do and he persisted that I find a low iron formula. After calling all around and being told no one has it, I called him back. He then wanted us to go on a soy/lactose free formula. (This was Tuesday) Just like before she did fine for a couple of days and now we are back to square one.
My question is, should I try switching her formula again? This scares me cause I don't want to make her sick. She's already struggling to poop and having really bad gas pains.
What would you recommend?
Should I seek an additional professional opinion?

Re: Help with baby acid reflux
DS: 11/8/11 | 9 lb 7 oz, 22 in
DD: 5/22/14 | 9 lb 9 oz, 21.5 in
1.) if your baby is truly constipated then that can cause extra spitting. We noticed that with DS1.
2.) Iron will make constipation worse which is probably why the dr wants you to switch.
3.) if it is reflux, our chiro was able to help with DS1's spitting. Meds can help with discomfort but won't stop the spitting necessarily. I had personal issues with the reflux meds so we worked with other methods first. The chiro worked so we have already decided that we will try that route first if needed again.
She didn't have the constipation when he told us to do a low iron. But I can't find a formula that either is low iron or none at all.
Thanks for the info about the chiro. I have a wonderful chiro who specializes in prenatal and infants. I didn't even think to talk to him.