I'd consider tossing the chips and peas and see if you can add something else to take their place that is much less carby. No idea if you are diagnosed diabetic or prediabetic, but in your shoes I'd be looking at what is causing that prolonged state and treating that. It's certainly not the fish.
Lots of variables to consider, if you ate some chips first and then started on the fish then your system will be hit by carbs first. However, it could be your body just isn't handling the carbs well at all now. All speculation of course, but as I said, look at what is requiring the most insulin output. Which seems to indicate some level of insulin resistance, but treating the cause of the rise I think is far more important. Which is the carb content.
Life isn't easy.