Quitting my job - advice!!

Hey ladies. So I got a really good job offer at a larger company who offers health benefits and they're giving me a 60% salary increase. My current position has no health benefits and my husband and I are struggling to pay the bills each month. Obviously my decision is not hard to make - the new position is exactly what I want but my problem is I LOVE my current boss and it is just going to be so hard to quit!! I'm doing it tomorrow so I'm super nervous!! Anyone been in this situation before? Any advice?