A new skype cant help you, as Long as the hacker has any of the names of your skype accounts, your ip will still be logged onto them.

Theres a way you can hide your ip on skype but if someone already has your ip saved they can still atack you.
As Long as you dont Change your IP address, nothing will prevent the attacks from Happening, try contacting the hacker and convince him to stop if you cant do anything else atm imo, or just try switching to 4G or 3G, since ddosing data is like throwing a feather against a steel wall.

Or just ykno
eat some cereal
enjoy a good book
stuff
become a Serial killer

http://whatismyipaddress.com/change-ip
^ also this; idk if it works since I tried unplugging a few times etc. and it never actually helped with my ddos Problems but maybe it works for you !