You might have noticed that in the databases links column there is a brand new link that will take you to the Clinical Trials (dot) Gov Home Page. This is a very useful database that works as "a registry and results database of publicly and privately supported clinical studies of human participants conducted around the world". A place where one can "learn more about clinical studies,..., including relevant history, policies and laws".
All you have to do is pay the website a visit entirely free of charge and enter details of your health issue. If anything is happening you will get that information straight. Currently, as the picture above so well informs the visitor, there are over 40 thousand studies taking place worldwide.
I just tried t look for any studies world wide on Sjogren's Syndrome and there are actually 43 registered in the database. If you narrow it to the United Kingdom, there is five that are actually currently recruiting:
(click to enlarge, image from ClinicalTrials.Gov)