If you haven't already done so please report this to the VAERS reporting system and to JnJ directly. They need to gather data on adverse side effects. TTS (low platelets combined with abnormal clotting is an adverse reaction to this vaccine.) I'm not a doctor or a health care professional or scientist, just an amateur researcher. From what I have seen so far is that Moderna seems to have the best long-term protection. There are heart issues with MRNA vaccines even though this is primarily in younger men, but protections from COVID hospitalization and death seem to be best with Moderna. Again, I would check directly on the CDC site and do a search with the current date and type in "Updates on booster and list each brand separately. It's a 'work in progress' with the data.