Numbing while pregnant

I’m 24 weeks pregnant with baby #2. During my pregnancy with baby #1 I experienced numbing of my legs and my ob said it was normal. It never stopped. So, I ended up going to the ER because the numbing made my arm numb and that’s not normal. The ER told me I was just having a bad kidney infection and to follow up with my OB. My OB checked me out, said I didn’t have a kidney infection and that numbing im feeling isn’t normal because of how frequent it’s been happening. So, my OB has been running a bunch of tests and is trying so hard not give me a MRI or spinal tap because I’m pregnant but she said that’s what is might going to happen because she needs to know before I go into labor just in case whatever is wrong with me effects the epidural. She suggested I may have MS and i looked into it and I’ve experienced the same symptoms as MS. Any advice?