Has anyone else gone through something like thi...

Has anyone else gone through something like this, in the last week my 6 1/2 month old DS has pretty much refused all his solid food, he barely drinks milk during the day either. Hes been having solids since 4 months and has been a brilliant eater, eating 3 meals a day for a while now. He has never been a fabulous drinker though, really inconsistent just snack feeds his milk all day long. So in the last week I havent been able to get him to eat much at all, the only thing hes happy to eat is his toast in the morning, and he saves all his drinking till the night, where he will wake every hour or two hours all night for big milk feeds. Should I be worried about this or will he start eating normally again on his own, when he wants to? Im also wondering if hes teething cause hes been a bit grouchier than normal in the afternoons, but I cant feel or see anything in there. Any ideas or similar experiences would be appreciated. Thanks Stef