The problem you are describing as having nausea
for the past 2 months and that it goes without having any vomitting. This appears to me like there is some type of indigestion
or some type of allergic problem with some food item.
Kindly try to make sure if you are having this problem with some specific food which you take in dinner or in the breakfast. I would suggest you to have a consultation with some nutricits regarding this.
The problem of stress
associated with this can also precipitate this condition.
Hope this will help you. Thanks