How long do Sjogrens flares usually last . My glands have gone up again my stomach is upset and I ache all over. When I was first diagnosed I had a flare that lasted for many months , I've had rituximab infusion and I've improved but I had a couple of 4-5 day episodes of nausea pains and exhaustion in the 8 weeks following treatment. I know everyone is effected differently but I would be keen to know if anyone else is effected in same way and are these mini flares ????