Kratom tolerance, help

[finis]

I live in chronic pain, inoperable herniated discs with entrapped nerves, at times totally bed/couch living. Pain Mgmt doctor reduced oxycodone from 80 to 40 mg per day at beginning of 2017, no reason given. it was happening to all I spoke with who are under his care. I was back to living in bed. Two months ago someone introduced me to Kratom, red leaf Bali. One gram of powder brought my pain level from 8/10 to 4/10 for ~4 hrs. Three doses of one gram per day allowed me to function with 10 to 20mg oxycodone at night. I can't take Kratom at night because it keeps me awake. But two months later it is taking 2 grams three times a day to get the same relief.
I am afraid, very afraid the Kratom will stop working as I have come close to the throwing in the towel due to pain. On YouTube one guy said the whole leaf must be ingested because the veins and stems stopped the tolerance issue. Is this true? Does anyone know how to stop or slow down the Kratom tolerance? Please help.
Kratom is legal where I live.