Swim Suit Chafing....OUCH

I hope some of you can help with this, especially those who swim lots of yardage. I am now swimming 4 miles non-stop daily with 1 day off a week and so far, so good; the body is happy as a bird singing. But I am having a terrible time with swim suit chafing. I wear a 2-piece (don't laugh) because of the freedom, but the swim suit top is giving me blisters in places I won't describe. Also, my neck, both sides, are getting blisters and then scabbing. I've been using vaseline on my neck and that helps, but it is so bad I am going to have to take a day or two off for them to heal because salt water and blisters is OUCH big time. Does anyone know about lanolin and where I can get it? And would it help? Any other suggestions as to products to reduce this? I guess I could always just take my top off, shove it in my bottoms, and continue on my way, but I don't want to frighten the beautiful fish. And then the blistering neck problem needs to be solved. ANY recommendations would be appreciated because training is going so well and I don't want downtime for this stupid problem!!! Any doctors here with suggestions? Any 1500 freestylers here? Any mega-yardage people here with similar problems? If this continues and I don't find a fix, I will be a candidate for plastic surgery right after my 18 mile swim to get rid of the scars!! :help: Donna