Many people find that having fruits or even vegetable juices when still consuming meat and byproducts will result in this kind of reaction giving a false impression that it is the veggies and/or fruit that is causing problems when it is the underlying combination that is.
Some experimentation here may be necessary if you value the consumption of juice.
For instance I used to react to fruit and certain veggie juices when I was still consuming grains and meat, but once I was raw vegan, this tapered off and then disappeared.