Hello Raymond,
There is always another way round things, keep the noon dose is and start your reduction with the evening dose, that is quite a large one and the top up for morning is small compared to it, could you sleep alright with a smaller dose for evening?
Not sure at how the dose you take was arrived at, 22mg per day and what size dose is each tablet worth, plus of course how long have you been at this regiem.
Is there a reason other than your body is feeling the large drop in dosage at AM therefore feeling the need for a top up at noon, for you to have the palpitations and fatigue? Are you particularly active or stressed during the morning for example. Diaz. has a long half life, if there was a way to even out the dose over the day it may help with the reduction, so your body does not suffer such a large drop?
All that sounded long winded! Simply put, can you adjust your daily intake into even doses, or break it down further to four doses of 5mg, keep it that way for a month, leaves you 2mg to top up should you feel the need, 2mgs is not a lot to lose out of such an intake, but it will help and will balance things up a bit. You could take the 5mgs AM - noon - PM - bedtime, say 7am - 1pm - 6pm 11pm something like that obviously to fit in with your daily routine and what you do.
Hope you are not still being troubled by the nausea, have found some way to relieve it. Do you chew gum at all? All kinds of things happen to your body as you change dose on meds. and this can include a mettalic taste, which could make you feel a bit ifffy. Prepare for anything with your reduction Raymond, it is not going to be an easy journey to take. You need to be strong, patient and kind to yourself.
Always here for you with a plan B, a suggestion or two and to encourage you.
Warmest regards, hugs too !
Jessie.