Snoring is definitely worse if you are overweight. The good news is that losing weight can help reduce it a great deal, and you're already well on your way for that! Sleep Apnea can also be related to being overweight (not always, though). As everyone else has pointed out, this is far more serious than simple snoring. It's best to talk to your GP about it. They can possibly put you in contact with a sleep clinic where you can be properly diagnosed since sometimes there can be other physical conditions causing the Sleep Apnea. Then they can advise on the most effective treatment.
It could be helpful for you to record yourself sleeping with a sound activated voice recorder. That could help your doctor with diagnosing your condition.
There are some other recommendations I found on a site about Sleep Apnea
- Lose weight. Overweight individuals who lose even 10% of their weight can reduce sleep apnea and improve sleep quality.
- Stop using alcohol, tobacco, and sedatives, or anything that relaxes the muscles of the throat and encourages snoring.
- Sleep on your side. Special pillows or remedies that encourage side-sleeping, such as the “tennis ball trick,” might help people who only experience sleep apnea when they sleep on their back. See Snoring Causes and Cures for more tips.
- Elevate the head of your bed 4 -6 inches. This can alleviate snoring and make breathing easier.
- Maintain regular sleep hours.
- Use a nasal dilator, breathe right strips or saline nasal spray to help open nasal passages.
For more serious Sleep Apnea you may need a device to help keep your airways open through air pressure during sleep. But definitely
see your GP about this.