Poor you!
If you take metformin for diabetes it might be that. I took metformin for 15 yrs, had my sleeve op and then about 6wks after the op I started with terrible sickness etc. My doc told me to stop taking the metformin and the day after the sickness stopped.
As the other post states you need to get in touch with your provider, the specialist nurses, and see what they say.
Take care x