MIGRAINES are a good one - go and get migraine meds [Just ensure you can take the meds without side effects] - often the cocktail has a tablet for relaxing muscles a bit which makes you dopey too - so you miss the RC day and have a good kip. Or just have the M without the meds ! Who is to know?
If female I imagine you have a few "hormonal' based options which men cant employ.
If you are a Depression sufferer [so many JW's are] be down ....you probably are already anyway with the thought of the RC looming. Have an ADD = Acute Doctrinal Distress attack.