Both my kids went through a similar 're-waking' routine around the same age, though my youngest was much worse about it. For us, I realized that they had been watching children's DVDs that to an adult were perfectly mild but it terrified my kids. Since they can't understand everything they see during their day, on TV or otherwise, it can lead iteself to having fears. We ended up having to put away certain DVDs, and even certain children's books, until they had enough verbal skill that we could sit with them and talk about what was going on. Simple things like a main character being afriad, dramatic music or even a mean look from the 'villian' would send my youngest into fits!
Also, it could always be teething. Those 2 year molars could be coming in at any time as well as any of the primary teeth that have yet to emerge. I think the best advice that I ever received about raising children is to become a student of them - especially in a situation like this when they can't speak well enough to explain, take the time to really study your child and the things around them and, in my experience, almost every time I can discover something that I never would have though of had I not slowed myself down and studied my child's world. All the childcare books in the world are no match for a mama's knowledge of her own child. :)
Lastly, I'd say I agree with one of the other posts - those kiddos get used to the extra night time attention really quickly. I'd always go and reassure my kids if they were having problems in the night and meet any needs (dirty diapers, check for fevers, find loveys, etc.) but I would avoid picking them up for cuddling if at all possible. I know how hard it is NOT to do that, especially when they're standing up reaching for you - my littlest one has a bad sinus infection AND is cutting those molars, poor thing, and I wanted to take her to our bed to keep an eye on her! But it is better in the long run to reaffirm that night time is for sleeping and there's plenty of time during the day to get lots of cuddles and attention.
Good Luck!