Goodness, I have one of those, but I haven't played with it in the longest time. I had trouble getting the health points up too, even with the trick-reward method, like you said. I would say, take it to the doctor (not too many times), in combination with playing games with it, feeding it, cleaning it, and disciplining it. Just like you've been doing. I think you'll be okay, as long as you don't let the health (or any other meter for that matter) go under 20 points. The instructions aren't that helpful as far as what you specifically need to do to raise each point category:
http://www.virtualpe...aq/instruct.htm (click on Cyber Kitty Giga Pet). I think you'll be okay just taking general great care of it.