Have had a very bad headache for 3 days now. Feels very similar to the headache I had with GCA although not quite as bad.Have been on 3 mg pred for the last 4weeks so don't think it's steroid withdrawal. Have upped to 5 mg pred today do you think this will be enough ? How long should I give it if this works before reducing again? I'm really gutted because I've been feeling so well.