RSI and accidents at work / sickness cover

I wonder if anyone can help, I am under the RSI as I am a co-owner with my husband of a small SARL (I'm non salarié). Times are a little hard so I have found myself a summer job to keep us going and there I am employed and salaried. Was wondering where I stand though with sickness cover (not covered under RSI?) or in the case of an accident in my summer job, would anything be covered at all? More than a little confused - any info greatly received!