Hello and welcome to HCM,
I am Dr Mbong. Stoping Oroamorph and MST suddenly probably caused the withdrawal symptoms
you have. The reason probably alongside pain which your physician proposed you 'go back up' before decreasing the dose again (this time slowly) before stopping.
This will reduce the withdrawal symptoms and take car eof your pain until you are put on another pain killer if you need it.
I know how u feel about this but is for your wellbeing and will help you greatly. In future before you stop medication you have been on for a long period of time, see a physician for counsel.