I don't have any solutions, sorry. But, sympathy in droves!
Our 15 month old is similar.
He's getting molars now, so that was my first thought when I read your post. Have you tried any teething remedy for him? We use homeopathics and have recently gotten an amber necklace that seems to help some.
Maybe it's just developmental? There's a lot going on around this point. Other mamas assure met that it gets easier, so I hope they're right!
Hang in there, good luck!
Married to P and mama to DS (1/09)and DD (09/13 ). I'm into friends and family, gardening, exercise, yoga, reading, knitting, photos, traditional foods, breastfeeding, home birth, babywearing, and much more.