would it be so bad if i have up breastfeeding now?

Sh

My son is 5 months old. we've been breastfeeding since day 1 as well as supplementing one or two feeds with formula. My breasts don't seem to be making enough milk as he pulls off and cries, after similar behaviour for 3 weeks when he had an ear infection. I've tried power pumping And fenugreek. Is it worth trying domperidone? herbal treatments aren't doing much in the way of stimulating mill production. or should I just start full formula feeding? I feel really guilty for giving up so easily but feel it's better if he's well fed.