I had 75% of my stomach and 100 of my Oesophagus removed for OC in 2014.
Having suffered with hypo's but not knowing what it was (I now do) and reading others here who are suffering and asking what it is? I thought I should write this. I am not a doctor, but have lived thru this and listened to doctors who have not been able to recognise what is happening and simply bundle up as "Dumping Syndrome". I see it as part of Dumping but not exclusive to that ie, you can have a Hypo without all the other bits of dumping and vice versa.
Maybe this will help you here?
I use a freely available low cost blood sugar kit from any high street chemist to measure.
My blood sugar now, typically sits between 4.2 > 4.8.
If I eat or drink anything with simple sugars in it (lets say I eat a Kit Kat) My blood will very quickly rise to 10+. Then at the 90 minute mark, it will plummet as low as 2.3 and in some instances lower!!!
My meter bottoms out at 2.0 then just reads "LO" As I understand it anything under "3" should be considered "dangerous" and most certainly will have brought on, some if not all of these symptoms:
Hanging onto lamposts
As the blood sugar levels drop, we develop what is referred to as "denial" symptoms, where we deny ourselves that anything is wrong and try to soldier on. Being is denial is strange. We do not recognise that we are in denial, but others will. This can also be shown as being angry in our responses to being asked "are you okay?"
All of the above does NOT stop when we go to bed. If you start to get the symptoms? Going for lie down, will not stop your blood from dropping or the symptoms from from occurring. You are now asleep, so will not notice it, but it is still going on, and you can pass out in your sleep!!! Scary stuff, as others will assume that you are simply sleeping when indeed, you are unconscious.
Waking up in the night with soaking bed sheets is a good indicator that you are having hypo's when asleep. You sweat so much that the bed is soaked.
I bought a Freestyle Libre testing kit that continues to operate while we are asleep. That showed that (as suspected) I was having hypos's in my sleep) this kit, alerts you when hypo's are happening during the day, or night, allowing you time react and take glucose.
If you are going hypo? The solution is to take glucose very quickly. I now carry a packet of Dextrose everywhere. Take about six of these and my symptoms recede within 5 minutes.
Now the bad bit:
People die from hypo's and recognising what they are, or that they are having them.
I broke my spine badly, in two places during one collapse. I have also damaged my wrists etc. Some have been known simply, to not wake up from sleep!!
I now treat my hypo's with prescription drugs that slow the sugar intake into the lower gut (Acarbose). Since starting this, and measuring my blood sugar levels, I have managed to avoid any collapse.
It is recognised that people with upper GI surgery (us) will very likely start to be affected by hypo's (Reactive Hypoglycemia) in one form or another.
Some say it is Dumping!! I say, It is not. It is separate part of the Dumping cycle "if" we ingest simple sugars? If we do not, then it is very unlikely we will ever suffer.
I do hope that this helps somebody?