Cows Milk protein allergy, anyone on Alfamino?

in Baby
My little boy is 10 weeks old with a CMPA. We were previously on Nutramigen but he was still reacting - sickness, reflux and extremely digested. We switched to Alfamino yesterday afternoon and tonight he's been screaming for hours, writhing and clenching his fists. Is that normal?
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What thickener do you use? We seem to react to carobel too so couldn't use it 😔