I think your hospital and midwife need to re visit their breastfeeding training.
Feeding every 1-2 hours in the early days is absolutely normal, that's how the milk supply gets going. Their tummies are tiny at that age, so they have to eat little meals regularly.
A day three poo is usually dark brown, it will get lighter over the next few days. As long as there are two poos, the size of a two pound coin, then it's fine, that's what you'd expect.
Over the next few days, you'll notice your milk coming in, and your baby taking big swallows.
It sounds like these professionals have really taken the wind out of your sails, but there is nothing - nothing - in what you have said that would make me think there was likely to be an issue with breastfeeding long term. (Or that top ups were required)
I think you need to talk this through with someone you can trust.
The National Breastfeeding helpline is staffed exclusively by trained breastfeeding counsellors:
0300 100 0212
Do call them - you can do this, you are doing it, and I'm sure you can keep doing it if you can steer clear of the bad advice.