yes and no. If you get under the foundation and take a look see, you should assertain the problem. I would guess that your joists are weakened or cracked.
If so, all you need are some new joists, a pier foundation, and a home jack.
I would speculate that the problem will only get worse and be a real problem. If you are strapped for funds and cannot do this now, try this:
Go under the home, sister some new joists to the defective one. The longer the sister, the better for dispersion of weight. Get some haydock or concrete blocks to make a steady foundation for a makeshift beam.
Cut several 4 x 4's a few inches longer than the span between the joists and the concrete foundations. Then with a hammer, knock the 4x4's into position to support the floor joists. This will not necessarily level the floor but it will support it until you can fix it properly.
Do this every 8 feet or so. In time the concrete blocks will settle in the soil and the 4 x will loose support, so then cut more longer than the first and do it again until the concrete finds stability or your funds come in.
Please be informed that this is only a band aid solution.