@Dory65 from my own experience, you won't have new symptoms--it sounds like you have the majority of the shitty ones already. Those two drugs are really quite similar anyway and I found no significant difference when I did the same change. Others have reported an improvement.
You can only hope that the slight adjustment might work in your favour. The next option which you might be offered is Exemesane, which is quite different. It was the last card in my pack, and I've found it more tolerable, but whether or not it is as effective as the others, who knows. I just assume it's better than nothing.
You'll never know if you don't give it a go. Mxx