My betta is acting very odd?

Did you just change the water, by any chance? Water going into an aquarium should be "aged:" left out to sit for a day or two. This is particularly important with tap water, as they add gases like oxygen in unnatural amounts to prevent problems in the pipelines. Oxygen is added particularly strongly in the winter, when freezing is a big concern. These extra levels create an imbalance competing against the fish's swimbladder, usually causing them to be stuck at the top for that same amount of time (24-48 hours) until the level readjust themselves. They often appear to be "dive-bombing" their ground as they attempt and are unable to swim down in the unusual water pressure. There is nothing you can do to instantly get rid of this extra air, though I've heard aerating the tank with a pump and air stone can get it out faster, but it is usually not deadly unless the levels are exceedingly drastic. It is, however, very uncomfortable for them and carries a risk of long-term damage if the fish undergoes it over and over. If this is your problem, just buy a bucket big enough to hold the fish's water and let it sit out for a day or two before using it. I use buckets meant to hold water for horses, so I know the plastic is water-safe. I tend to have to use some water straight from the sink to get the temperatures to the tank's proper level (a heater in the tank didn't work due to lack of circulation), but small amounts do not cause the same problems as having a large proportion of the water "unaged."

The only other options I can think of are water quality issues or parasites, which would cause your fish to be uncomfortable and swim erratically. A simple test strip kit can determine if it's the first, and proper medication can solve the second.

It doesn't have enough air, so it goes up, gets some and, gets heavier, and sinks. there are machines that "give" air. Trust me, the same thing happened to my fish.