I too think that you are suffering from withdrawal symptoms. Butterflies in the tummyis one of the first symtoms to effect me when I stop taking anti-depressants. Not sure about the constipation, it may be linked too. Try drinking more water, that may help with the constipation.
When I suffer butterlies I try and eat normally as not eating much can make them worse. Try eating more regularly but smaller, lighter meals. Try not to worry about v*ing I am sure you won't even come close, any nausea you may feel will be anxiety nausea, so try to keep ascalm and as relaxed as possible. Tell yourself what you are feeling is a normal reaction to coming off tablets that you have been taking for a while. Your body is just re-adjusting. You don't have an sv or anything like that, just a few withdrawal symptoms that will decrease more and more as time goes by.
Hope you feel better soon.
Tracey
.•:*¨¨*:•.Tracey.•:*¨¨*:•.
Fall seven times, stand up eight.
- Japanese proverb