zykes, yes, benzos and codeine too... bad idea becomes worse idea...
i'm sorry Jen... i wish i had some ideas for you instead of just sitting here being the bearer of bad news.
i honestly don't feel comfortable suggesting even herbal remedies - it is harder to find out about interactions, and also if they are strong enough to cause sedation, they can be strong enough to be a problem with your other meds too, you know?
do the best you can to stay sane. get as much rest as you can even without sleeping. do you ever meditate, or do breathing exercises? not to help you sleep i mean, but these things might help you feel better in spite of not sleeping is my thinking here...
~ waves ~ so relieved that you are not going to take the diphenhydramine...