i would recomndt kali linux. its free and vpn is installed there and pro hackers like me uses it everyday
... No DoX is where you find personal information on someone. DoS is a denial of service attack, aka a singular attack. Whereas a DDoS is a distributed attack performed by multiple machines and or people.
A DoS a Denial of Service which comes from one source, a DDoS (Distributed Denial of Services) is when the attack comes from multiple sources.
A DDoS is (like @Elrak said) distributed denial of service, which means the attack is coming from multiple sources, this is usually performed by multiple people, and a DoS is usually performed by just one person - as it's a non-distributed attack, so it comes from a single source only. ^^^
Try and avoid double posting ;) But yes, the attacking user would lag out also. When I have done a DoS (not for malicious intent), it does slow my computers connection down deeply. I made a thread here, if you wish to see more on this matter; http://www.mineverse.com/threads/dos-ddos-and-doxing-explained-properly-with-prevention.89034/