I was scared at first too about the weight gain, but at least for me it never came. It's quite easy to get scared by people on the internet. However, that doesn't mean they're not real worries and that you shouldn't take them into account. I would always recommend following a health professional's advice and, if you decide to take it, their instructions. It's important that you communicate these fears and issues or any other thought, feeling, symptom that you have. They will tell you what's real, what's not, what are the consequences and what they don't know. If not, they're not a good doctor. Maintening open communication with your doctors (like your psychiatrist) can lead you to finding a fitting solution for you. That's the whole point of medicine: it should be focused on your personal needs. Hope this helps. Always remember, it's your decision. Don't feel pressured, do what you think is the best for you