definately could have been the Bladderwrack. if you experience ANY odd side effect after taking a new supplement, i would get advice from a herbalist. It stands to reason that any new substance you ingest that your body has not come across before, or have not taken for a period of time will ellicit chemical changes throughout your entire system. This can result in either physical or mental changes to to what is your normal modus operandi. It could also be a drug interaction - bladderwrack is a mild anticoagulant, & could enhance the effects of meds like asprin & warfarin.
the body is sooooo complex, I seriously wish I had an instruction manual.
Definitely stay away from the med and ask your dr is my suggestion. Could be a delayed reaction .. but 12 hrs is a lot for anaphylaxis but who knows if the ingredients are time delayed in the med release?
I have not heard of a delayed allergic reaction like that. Usually, a reaction will appear around 45 minutes to maybe a few hours, but, as everyone's body is different, I guess it is possible.