Been drinking about 100oz/day (weigh 215 lbs), in sept fasting glucose was normal, insulin was 21. peeing 10x/ day. should i worry?

Could be normal: Hi. Normal fasting glucose is not the only criterion for normal glucose metabolism. Normal fasting is encouraging, but there are folks who meet criteria for prediabetes and (fewer ) for diabetes based on 2-hr post-challenge glucose or A1c, who have normal fasting glucose. So you could push further with testing if desired. Eat healthily, exercise regularly, and don't smoke.