Hello and welcome back Gadfly!
I am sorry to hear that you have run into some difficulties. It is especially disappointing after doing so well all along the transition. :/
Since your P-doc is not available...perhaps you can try calling your GP, or even your pharmacist for advice on how to proceed.
I am wondering if water titration of the 37.5 dose might be a good way to go. In this method, by dissolving the pill in water, you can get micro doses by drinking just a bit at a time until you feel relief of your discontinuation effects....thus not fully reinstating.
I wish you the best! I hope things have been well otherwise...and encourage you to keep posting for support.
S.C.