As soon as one notices someone breastfeeding and feels disturbed by it, the damage is done; and I don't know about you, but I can't call up amnesia to order.

Nope, but let's be clear about it: you have a specialised reaction to seeing a baby breastfeeding. Just as some people react badly to seeing two men kissing (who have no objection to seeing a man and a woman kissing). You have, it appears, a mild phobia about it. It's your phobia. It's your problem. It not the problem of people around you, breastfeeding or not, to help you out: you're an adult, you need to manage your own phobias without, as far as possible, disturbing other people.