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Talk with Rev's family and the hospital staff. The "family-only" rules for Intensive Care are usually relaxed for fiancees and significant others, if the family approves.
Me and my family's thoughts and prayers are with you both.
I hope they have done toxin screens. Sounds like a toxic/poison reaction.
A Tricyclic could also do this. Has he been on any for lower back pain, migraines, OCD, separation anxiety, or any other chronic pain? It certainly sounds like it could be tricyclic poisoning: