limping with medium and small PP UTG, UTG+1 and UTG+2

[FlyingStart]

Because of the implied odds you get from flopping sets in NL HE I try to see as many flops as possible with PP, but a situation the frequently arises is when you limp from the first three positions, a couple more limp behind and then someone raises for like 6 times the BB.

Should I just stop playing 22-88 from the first three posistions, fold to the raises or call the raises (sometimes the raises can mean high cards too which the PP are favorite agaist)?

And when someone makes a big raise, how many callers should you then have just for implied odds on the set (assuming you toss when you don't hit)?