Silent reflux returned since starting solids

My boy is 7.5 months old and started solids a about a month ago. He developed reflux (mostly silent) at about 3 weeks old and we managed to control it with homeopathics and an oseto.
Since starting solids he is waking up to 10x a night screaming. Day sleeps are fine because he's on his back for 2 hrs at the most, however, at night time he gets to about 5/6 hours of sleep and then he's up hourly in pain and smelling acidic. We are still seeing the homeopath and osteo but it hasn't been as successful this time.
Has anyone else experienced this? Were there any particular foods that set it off?
I've been very careful with the foods I've introduced due to the previous reflux issues. He has only had pumpkin, sweet potato, zucchini, carrot and avocado so far (he's had a couple of jars of organic baby food while we've been away but still just the vege listed above).
The lack of sleep is taking it's toll on all of us. He's definitely in pain and I just don't know where to go from here.