Nah, Colchester is about an hour tops from Southend
If you're going to visit Colchester, and it's a weekend, let me know, and we can hook up somewhere. Colchester has some OK nightlife, if you're into clubbing there's a few clubs, or if you're a more rocky person, there's a great place called The Twist that has live music every night!
There's a couple of campsites around Colchester, and some B&Bs as well.
Garry