It's true that excess
tramadol can lead to seizures and you need to be careful, but as time goes on, your tolerance for tramadol builds and your body reacts to it less and less over time, assuming the daily dose does not increase.
But doses often do increase, and you said your dose increases all the time.. the dose you take is up to you, it is in your own control. You don't NEED to increase the daily dose. But often tramadol users increase their dosage on a regular basis for one reason or another, and I think this is the danger. Eventually the dose could get so high you run a risk of seizure or seratonin syndrome.
If you've tolerated it so far at your current dose, if you're careful to stay under that daily dose you'll probably be ok. But if you keep pumping the dosage higher you'll be in more danger IMO.
The longer you stay on tramadol the more likely you are to become dependent on it. Then when you want to quit you'll have pretty severe withdrawls. It doesnt happen to everyone, and hopefully it wont happen to you. But I am dependent on tramadol just like many others, and I've been taking 500mg/day for two years. I've tried to quit and can't, the W/D's are too bad.
Be careful, and good luck with it.