Neuro Appointment

Hi everyone I’m a little confused, I went to see my Neuro today I thought to discuss starting Tysabri. I was so pleased and shocked when he informed me that I have no new lesion on my MRI since my first one in 2010. I have had a lot of recent relapses and my walking has deterioted. Why then would he suggest I stop Copaxone an stay on all other meds? He doesn’t want to start anything yet? I have to wait a few months to see how things progress?? I’m happy no new lesions but bewildered as to why I can’t start anything yet? What happens if I have a big relapse or maybe I will be ok? Maybe it is all in my head??? Advice and thoughts please