I'm 6 months post-op gastric sleeve and have had stomach pain ever since. Is this normal this far out after surgery?

Your symptoms are not typical this far out from gastric sleeve surgery, and they should not be dismissed. While some discomfort can persist for weeks to a few months as your body adjusts, ongoing stomach pain—especially stabbing sensations that occur even when you’re not eating—is concerning and warrants a more in-depth evaluation. The fact that you’re experiencing chills at night, extreme fatigue, and persistent pain suggests that there could be an underlying issue that needs to be thoroughly investigated.
Stomach spasms immediately after surgery can occur due to swelling or irritation of the stomach tissue, but these usually resolve with time and appropriate management. However, persistent or worsening pain months later raises concerns for possible complications such as a stricture, ulcer, gastritis, or even a slow-healing or missed leak. The absence of fever does not rule out infection or inflammation, especially if you're experiencing chills and fatigue—both of which are signs your body could be trying to fight something off.
It’s important that you advocate for yourself. While healing does take time, a change in the character of the pain, particularly to stabbing sensations and non-meal-related discomfort, should prompt your surgical team to conduct further diagnostics. You may need imaging studies such as an upper GI series or a CT scan, and possibly an endoscopy to look for internal causes that might not be visible on routine tests. Blood work could also reveal signs of infection, inflammation, or nutrient deficiencies contributing to your fatigue.
You’re right to listen to your body—what you're experiencing is not consistent with the usual post-op course, especially when compared with others at a similar stage. I would recommend insisting on a more comprehensive workup to get to the bottom of your symptoms. You deserve answers, and this situation should not be brushed off.

Hello, after reading your information I would definitely consider the case for an evaluation.
The first thing is that you must evaluate yourself with a certified bariatric surgeon to review your case and then proceed to check you.  There are a lot of factors that can be and should be considered before giving any exact information. Make sure to discuss this with your primary physician. Keep in close contact with your surgeon and go to support groups. 
My Best Wishes,