Anyone regret switching to formula?

Has anyone regretted switching to formula? I’m pumping right now and trying to find a formula that my baby with some diary problems (and possibly other allergies) will drink and do well on. I’m currently dairy free to try and help him but idk if mentally I can do this for 9 more months until he’s one. But I’m scared of switching to formula and having his spit up a lot or have diarrhea