Hi mummies, I suspect my baby is having formula milk & soy intolerance.

My baby is 7months old turning 8months soon and has been exclusively breastfed. My breast milk stash is about to run out, but our next appointment with a specialist is a month away. My baby is suspected to have an intolerance to both formula milk and soy, and I'm worried about what to feed him in the meantime. I mix fed my baby with formula & breastmilk but he vomited 3-4 hours after drinking each time. (I’ve tried three different brands it’s the same reaction every time) Since he has started solids I gave him tofu as a finger food, and he vomited and had diarrhoea. Has anyone been in a similar situation? What formula did your pediatrician recommend? Any advice on a good temporary solution would be so helpful. Thanks in advance!