Welcome to HCM,
After going through your history,there is strong possibility of infection most likely fungal so get examined her and yourself for it and may be both the partners need treatment,there are other possibilities but as there is no discharge but still bacterial and trichomonal infection is possible.
She may be given treatment by pessaries.
Please also check for blood sugar level to see there is no diabetic issue.
Other ting simultaneously present could be dryness or less lubrication, once both are treated and lubrication is problem then you can use lubricants like KY jelly.
This should help you and you can enjoy like in past.
Please take care of hygiene and practice safe sex