As the PP said, pumping will only stimulate your boobs to produce more. I would really advise you to get back to nursing exclusively and just offering the breast whenever you start to feel engorged. If your LO doesn't want to feed then hand express enough to make you comfortable.
Engorgement suuucks and the first few weeks are really tricky, but pumping will only complicate things. Your baby is actually much better at draining the breast than a pump, so as you're signaling more milk production, you're also not draining it as effectively.