Considering the fact that there will be (most likely) hundreds of nodes, it is not something THAT easy to DDoS all of them, but in case something like that happens the answer is, yes. There is a possibility that they can see your IP (even though chances are not that high) and possibly make a DDoS attack. If you are really keen on running bitcoin nodes (or any altcoin nodes in particular) you can check out some cheap VPS providers and host your wallets on VPS's alternatively, VPN is your option.