I used pepti junior and neocate from 6 months. My daughter was breastfed for the first 6 and I had to stay on milk free/ caffeine free diet. She was also on losec form the second month - it helped a lot. I think we switched quickly to Nan Ha 1 formula and she was happy on it. The reflux went away around 10 months.
She still gets funny poo from time to time and we think it might be from milk so at the mo she is on lactose free formula.

All the other issues disapeared by the time she was 1 so hang in there.
We also had her cot raised at the top and tried to keep her upright at least for 10 min after feeding. We used fr Browns bottles whch were great as they reduce the amount of air the baby swallows.

Hope this helps