Starting any antidepressant can cause side effects. They usually do wear off after a couple of weeks but please speak to your doctor if you are worried. GI symptoms are very common. I felt very nauseaous when I started taking mine but this disappeared after a couple of weeks.
Have you an information leaflet with your meds? This should list the side effects that can occur with this drug.
Try not to worry as this is common with a lot of people and it should go.
Take care and keep in touch, let us know how you are doing
co-moderator : depression