Coral grows on the mooring lines so it is possible that you have very small lacerations on your hands. You should always where gloves anytime you touch anything underwater, especially a mooring rope.
This happened to my girlfriend when she did her OW dives in Cayman, her instructor told her to hang on the mooring line for our safety stop. Being the highly educated girl that she is, she was a great student and kept her bare hands on the mooring line even though I attempted removed her hands a couple of times while were at the safety stop... I was floating next to her at the time... While the current was gentle, the swaying caused enough friction to cause very minor lacerations on her hands...
She called DAN when we got home because she had similar symptoms that you describe. Fortunately it was just coral lacerations. Her doctor gave her a prescription of Cortisone and in about two weeks she was as good as new...
That said, no idea if you are having the same problem but you should mention it to DAN when you call as well as to your local doctor.... Hope you feel better soon! Also, welcome to SB!