The last time I studied special relativity was a while ago, but I think your mass only increases in other frames of reference. If, for example, we consider the

The last time I studied special relativity was a while ago, but I think your mass only increases in other frames of reference. If, for example, we consider the speed of your ship from the point of view of someone left on earth, then your ship should appear heavier from that person's perspective as you accelerate. But from your point of view, you still weigh the same, and so does your ship. In fact, you would see earth going through the dramatic "weight gain".