Withdrawing off heroin is tough
Can u ask ur Doctor for phenergan? It is a safe drug/helps sleep as well and most drs will call it in for a tummy virus as it is not addicting
Anxiety lasts for a while after wds are over//physical wds,,,nausea can be an anxiety response for some,,it is for me
Exercise can help alot as well to lower anxiety if that is the case
If u do not have a doctor to call, walmart has an Anti-nausea medication/syrup that works great as well//their brand
Its sounds like you have the flu and if it doesnt go away in a few a check up