Thanks for your question on Healthcare Magic. 
I can understand your concern. 
Sudden Sweating of palms and feet, chest congestion etc are characteristic symptoms of heart diseases. 
So better to first rule out heart related diseases in her case. 
So 
consult cardiologist and get done ecg, 2d echo and 
stress test (trade mill test). 
If all these reports are normal then no need to worry for heart diseases. 
She is 41 years old. So she is approaching 
menopause. During this period, women tend to develop 
hormonal imbalance and this can also cause similar symptoms. 
So get done hormone levels to rule out hormonal imbalance. She may need 
hormone replacement therapy (HRT). 
Don't worry, she will be alright. But first rule out heart diseases. 
Hope I have solved your query. I will be happy to help you further. Wishing good health to your wife. Thanks.