I didn't have a sucky baby but when he was really young I used to offer him my little finger to suck on if he looked like he was wanting something in his mouth. He would progress to crying if he was really hungry.
If you can, separate the E from the S with something, even just a nappy change. Maybe the visit to your parents could be useful in that they could distract him for a while?
I would try to space feeds at least two hours apart and work on sleep separately, myself. He can be held or rocked to sleep etc but the feeding to sleep is a harder prop to break.