Follow on milk after colic and constipation

[Jobarnes]

Could anyone advise/ help please.
Our 14 month old has been on aptamil colic and constipation formula since 2mths old. Its the only formula after trying numerous others that didnt make him vomit or have tummy ache. I am wanting to find a cheaper alternative to change him onto but everything i have tried he will not drink..cows milk, lactose free, soya, almond, horlicks..all make him sick.
He still goes to bed with formula but now his brother has come along i dont want the cost of buying two different formulas.
Has anyone had the same problems and could recommend anything i could try that would work please

[JiltedJohnsJulie]

Have you thought about going to the GP OP? It does sound as though there may be an allergy to cows milk and possibly almonds.