Have I got shingles again?

This is probably either a mild illness because shingles cannot occur on two sides - it is a unilateral (one sided) outbreak. Treat the headache, continue to observe your right arm area and if a rash occurs, see your family doctor and get medications that need to be started immediately. You need to do some exercise each day - walking briskly for at least 20 minutes is easiest - as a stress reducer.