I don’t blame you for falling out with MS. It’s not my friend either.
DMDs vary as to their initial side effects. You can check out https://www.mstrust.org.uk/understanding-ms/ms-symptoms-and-treatments/ms-decisions/decision-aid to compare DMDs together with their side effects.
If you want something that generally has no side effects, but a fairly low relapse reduction rate, I would go for Copaxone. I was on that for 5 years without a single side effect (although some people do get injection site relations).
Or, if you qualify for it, Tysabri isn’t too bad for side effects, might make you a bit extra fatigued for the following couple of days but it’s a once a month infusion and has a great relapse reduction rate.
The beta interferons (Rebif, Betaferon and Avonex/Plegridy) do tend to give you fluey type reactions, but people do manage them with paracetamol.
Tecfidera can give you an upset stomach, but that is usually managed by a) very slow start (ask for extra of the half dose rather than one week on half dose then straight into full dose) and b) packing the Tec in with food either side.
Talk to your MS nurse about your terrible reaction to steroids and your fears about DMDs. As it seems you won’t be able to take steroids in the future, it’s possibly more important for you to reduce your relapses so to be on a DMD.
Hopefully you’ll find one that suits you.