It sucks big time, and I feel your pain. We started investigating further issues with Delaney when it became a 2x a month trip to the doctor. At that point, we began discussing tubes...the doc said let's hold for a bit. A couple of months later, we requested a referral to an ENT. 2 appointments with the ENT and tubes were put in.
You're the parent. You have instincts about your child that your doctor doesn't have. If you're inclined to believe that there's a bigger issue, request a referral. Ultimately, YOU do what you believe is best for your little one.