The reason behind low mood or mood swings is falling oestrogen levels.
Oestrogen acts as a mild anti-depressant and generally makes us cheerier. With less of it around we can feel very emotionally vulnerable and weepy, even though our brain tells us that there is no real reason for our feelings. As the hormones rise and fall you can find that your mood and emotions are affected.
There are several things you can do to make yourself less vulnerable.
Firstly you may find taking a plant based phyto-oestrogen, such as Menopause Support, helpful. This is known to gently even out and balance oestrogen levels in the menopause, thus reducing symptoms.It also contains magnesium which is very important for mood, relaxation, and sleep.
Secondly you could consider taking Hypericum, if you are not on any other medication. This is a mild plant-based anti-depressant that many women find very supportive during the menopause.
I would suggest using the Hypericum tincture format, as it works faster than the tablets. Or if you are feeling more stressed or angry you could look at Stress Relief Daytime to take the edge off.
Thirdly, exercise makes you produce more natural anti-depressants in your own body, so although it's usually the last thing you feel like doing when you're low mood strikes, a 10-20 minute walk or quick jog around the block or even 5 minutes with a skipping rope will make you feel a lot better.
If you get used to doing a small amount of exercise most days - just 10-20 minutes, nothing drastic - then you will be better protected against low mood.
You may also find Mood Essence or Confidence Essence helpful, and these can be taken alongside any other medication or supplement.