@beansprout55 is little one bringing up milk? Our daughter brought up a lot - we went through countless changes a day, both her and me. We saw a paediatric consultant when she was three months old, who diagnosed reflux and talked is through the options: baby Gaviscon, which can give constipation, and he wasn’t keen; Colief, which he recommended and we tried. It didn’t work for us, and it’s a faff to give to a breastfed baby, but some find it helpful. Or Omeprazole- that’s the most effective, but also has side effects - e.g. it can cause agitation and disturbed sleep. In the end, we decided that since she seemed happy in herself, wasn’t suffering and was growing well, we’d just wait for her to grow out of it. She did, the vomiting stopped by about six months, and she’s never had any issues since. In fact she’s not a particularly vomity child now, and rarely catches any tummy bugs. On the other hand, a friend’s son had very severe reflux and Omeprazole helped. But his symptoms were different - he actually didn’t vomit a lot, but had a persistent cough, and cried and struggled a lot. Sorry, this is a very long answer, but my conclusion was that there isn’t a straightforward one size fits all for reflux.
As for travelling at 6-7 weeks, I found that was OK with our daughter (EBF). It’s easy enough to stop and feed her even in the car (stationary car of course!) as needed. In fact I found being out and about with her a breastfed baby was very straightforward. Just needed a changing bag to change her nappy as needed, and we were away.