What we did was we used the lice shampoo once or twice, but what really got them was we used a mixture of veggie oil and rubbing alcohol (Or vinegar works too) and dipped the nit comb in it, and treated our entire head of hair that way with the knit comb, and then showered after without using the lice stuff.
Put your pillows and stuff that cannot be washed into the dryer for cleaning, don't continue to use the same pillow without treatment! Wash sheets and other articles of cloth.
You don't have to avoid people necessarily, but keep your head away from fabrics and other peoples heads.
I suggest you use lice killing spray on your bed before you reapply sheets each day, as lice on the bed will stay on the bed if you don't.
Also, clean your floor with lice killing stuff- it's in a powder form, you dump it on and leave it for 24 hours without stepping on it (I put newspaper down so I could walk) and then vaccum it up.
Tell your friends and family about this, too. If they have given it to you, or if you gave it to them, you want them to know, otherwise it'll just keep coming back to you!