Very good advice from narmada. Reflux is miserable.
We mixed IG with the correct amount of water per sachet, but then only gave one 5 ml syringe with each feed. My EBF DS fed so little and often, I figured a little IG would help keep each feed down. The 'six times a day' thing only makes sense for a formula fed baby on a schedule (i.e not fed on demand).
Dummies have helped every refluxy baby I heard of.
We also found keeping Ds upright after feeds in a Baby Bjorn, facing us, helped keep feeds down and calmed him when he was distressed after being sick. Baby Bjorns have a bit of a bad reputation with sling mums, but I think that's to do with the facing out position - and frankly, as others have said, do whatever makes the baby happier.
Let burps come out gently - we just held DS upright, either over a shoulder or in a sitting position until some burps worked their own way up. Rubbing and rolling him around was the worst thing to do, as it turned out - all that sore acidic reflux just shot up into his throat. :(
DS also got badly constipated on IG - the BF friendly GP said to give him a teaspoon of freshly squeezed orange juice, and this did help. The HV said not to, EBF babies shouldn't have anything but boob milk etc - usual conflicting advice. We went with the GP. Don't be alarmed if you get a very green poo, that's a side effect of IG.
And I'm sure you are doing it already, but raise the back legs of your cot, if your baby sleeps in one - so their head is higher than their feet. You can use books or anything else stable. If they lay flat on their backs, the acid reflux tends to rush up their throats. DS was spluttering, choking and crying for weeks at night before I found out that's what was happening.
Good luck, it is miserable. (My DS improved at around 4 months, and all refluxy issues VANISHED overnight when he was started solid foods at 5 and a half months).