Hi.
I've gone through your query and I can understand your 
anxiety. 
Vaginal Thrush might be due to candida / 
yeast infections & spreads through sexual intercourse. Also 
stress plays a major role. 
Women who tend to take poor diet, compromised immune system leading to diseases (
diabetes & HIV) , sleep deprived, illness etc are at high risk.
I would advice you to, 
1. Maintain good hygiene and wash your vagina with soap warm water regularly. 
2. Avoid feminine products 
3. Use soft cotton undergarments 
4. Candid B V gel . It's very effective for yeast infection & will be cured in 7 - 14 days. 
Hope I have answered your query. Let me know if I can assist you further. Take care. 
Regards, 
Dr. Yogapriya V, General and family physician.