The 4.3 & 4.1 are not that low but you might have been dropping rapidly. Once you get used to the feeling, you will probably tolerate the lower bg numbers a little better but also recognize it for what it is so you can react.
Weight Watchers is great. Points are valuable indeed

but get different flavors of those glucose tabs so you have some variety. My biggest complaint is there's no chocolate

. Also, after you take the tabs to correct, you may feel ravenous. Don't eat everything in sight (as many have done) and end up high later.
Don't make yourself nuts over the points though - you have the extra 35 per week if things get crazy and treating the low is WAY more important than missing points for the day.
Good luck,
Mike