Here's the article about the study they did in Japan:
Why using a computer can cause depression | Mail Online
Anxiety and sleep problems have been reported too, yup!
At least if you're behind the computer a lot, have breaks, go for a walk (or at least around the house), dance, exercise (at least stretch a bit), drink some water/herbal tea... Back and neck problems or eg scoliosis etc can appear or get worse otherwise too... (personal experience too!)
So, even if it isn't easy, consider your health... Internet does make me feel energized too, if I'm researching or reading something interesting, but I try to minimize my time online now, and add breaks.. Turn it off earlier these days too, my mind needs at least an hour to 'turn off' and go into 'sleep mode'...
Anxy, if you go through interests quickly, consider you might be what Barbara Sher calls a 'scanner' (people who constantly scan the horizon for something new
or have strong multiple interests, sequential or paralell) There's a book about it, Refuse to Choose, there are Barbara Sher forums too, and there's another site Puttylike.com where people with multipotentiality hang out.
You said you love being behind the computer, so your lfe isn't worthless, you just showed you love doing certain things a bit, err, too much... Maybe some of it could be channelled into a career prospect too? (If that's what you were talking about?)