Headache at left side head. Of stress!

Hi doctors, i had a c.sec last December 30th. am lactation mother. am feeling headache as few months like head tighten and freeze . once left and other time tight. sharp pins also came at some times. i thought that because of fullness of breast milk. but now at some times it is coming at left side of the head slightly pain for few minutes and gone. and today while chewing snacks it is held like falling down in inside the head. am feeling like numbness in the face and always getting thought of something is happening to me like feeling. this is all stress headache or tension headache .or something else. last month i went to endoscopy have small ulcer . used triple thyrapy and using esmoprazole medication. pls  tell  me. what is happening to me. is this any serious issue. am getting worried about this. because of this am not caring of my 11months baby . am getting so much of stress