youre doing great.
it was just a lamp, you feel like crap, you apologised and went shopping for a new one and you talked to them openly about the incident. no damage done.

i think my kids and i were able to maintain a close and trusting relationship because i was open about my feelings and i always said im sorry when it was called for. they are now 22 and 19 and they still know how to push my buttons but we are really close and they are very supportive of me during my episodes.