Hi, 
Apart yeast infection, the severe burning in your vagina could be related to: 
- intestinal 
parasitic infection which might migrate from anus to vagina
- 
allergy due to any new detergent or intimal cream/douche used 
- dis-balance of the vaginal microbiota (possible bacterial infection)
- if sexually active, possible allergy to condoms 
I suggest to : 
- run a vaginal swab testing
- examination of stool for ova/parasites
- do abdominal ultrasound
Meanwhile, if you apply the anti-yeast cream locally and it will burn more, I'd advise to stop using it and run the above mentioned tests. 
I also advise to: 
- apply 
cold compresses/Greek yogurt locally
- do use hypoallergic vaginal douche/cream
- insert lactobacilli ovules in the vagina
Hope it was of help!
Dr.Bardha