I'm 50 and one minute I'm fine then out of the blue I'm crying And feeling so down and tired. Is this a normal reaction to being meopausal?

Yes, this is quite a normal set of symptoms and it's caused by low oestrogen. You may therefore want to look at a natural plant oestrogen such as soya isoflavones as well as doing some simple, practical things to help yourself.
 
For example, exercise makes you produce more natural antidepressants in your own body, so although it's usually the last thing you feel like doing when your 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 could consider taking Hypericum, if you are not on any other medication. This is a mild plant-based antidepressant that many women find very supportive during the menopause. I suggest using the tincture (liquid) format if you go for this one, as it works faster than the tablets.
 
You may also find Mood Essence or Confidence Essence helpful, and these can be taken alongside any other medication or supplement.

Eileen Durward