Relapse after Lemtrada

Hi 👋 I'm hoping someone here can shed some light on this for me. I was diagnosed with RRMS in January 2015. After a series of bad relapses mainly affecting my legs and mobility, I was put on lemtrada in the summer of 2015. I had my second round in 2016. I reacted well to the treatment and was stable although the damage on my legs and mobility was already done. I had my first child in 2018. Whilst I've had flare ups during my time on lemtrada, I haven't had an actual relapse. Existing lesions have flared up but I've only had one new lesion on the front of my brain. However, due to the pandemic, I haven't had an MRI for almost 2 years. Since having my first, my mobility has slowly been getting worse- I'm slower, in more pain and generally just feel more disabled. We decided to have our second child before things likely progressed too much and I had him February 2021. He's now 4 months old. My body has been threatening with flares since I was pregnant but this past week, I've had my worst relapse to date. Even worse than my very first one. I can't walk even with double crutches, my grip strength is dramatically worse, I can't hold my son properly, I need help moving my legs, help on and off the toilet, showering etc. I went to A&E as it was impossible to get hold of GP and ms nurse (over stretched no doubt) and the on call neurologist said I'm having a severe relapse and has put me on IV steroids for 3 days. I have a meeting at the relapse clinic with my ms nurse next Wednesday to discuss MRI and treatment plan. As I am now past 5 years of treatment of lemtrada, am I right in thinking that I can go onto another med? As I said, lemtrada was good for me at the time but I'm reluctant to go for that again due to the potentially dangerous side effects when I have two small children and the fact that ocrevus has now been approved in the UK? Also, I read on the Ocrevus fact sheet that it's also for 'early provressive'. As I am declining (my mobility assessment has said I'm much slower walking now even with an FES stimulation machine one) and my EDSS score is 6-6.5. On the ocrevus fact sheet, it says if your EDSS score is above 5. I'm sorry if this doesn't make sense. Thank you if you read all of that!