panicked after drugs delivered so many questions

I was diagnosed a few weeks ago after having 1 cis but other lesions on my MRI so advised to start dmds. The consultant advised betaferon. I meet with the ms nurse who said I could choose. This week is the first time in 7 weeks that I have left the house and my energy is returning and the pain better and I’m due to start betaferon next week. I will start off on a lower dose and then increase but I’m worried about the side effects and also the long term use of this drug even though I know I have to start.I have 3 children and am just starting to function again and dont want this to stop. I have also been researching and find that im drawn to copaxone as you dont get flu effects and potential liver and thyriod damage. I am concerned though regarding allergic reactions and also as I’m very thin i haven’t much fat to inject into. My drugs have also been delivered, is it too late to change my mind. A good friend also called me and said she had a colleague who had been using betaferon for years and advised never to use it which has stressed me even more. I have started taking fish oils and d3 and am having a low fat diet. I know everyone is different but I just need to hear other peoples experiences as my mind is in overdrive and I know there is no magic answer but feel the more informed I am the better decision I’ll make. Thanks