Caroline
Being in the Support Group should enable payment of the Enhanced Disability Premium which in turn should lead to an ESA(IR) top-up, however, I'm not sure I understand why your previous entitlement to ESA(IR) would have ceased because you were moved into the Support Group.
You need to contact the DWP for an ESA3 form which will capture your current financial situation so they can decide whether you are entitled to ESA(IR).
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems