Blue Kingfisher, I'm not sure if these are words of wisdom but I can give you my own personal experience and that is, once oestrogen levels drop, a whole host of things can go wrong. For a start, although I don't have a thyroid problem as such, my reading are getting decidedly borderline when my oestrogen is low and that goes for cholesterol and blood pressure readings too.
You say you have spoken to your doctor, will he/she prescribe Oestrogel now? If so, grap it with both hands and start using it immediately. You can let them prescribe the progesterone part but you don't have to take it straightaway. Also, make sure they prescribe gel and not patches or anything else.
If I were you, I would take the Oestrogel, use it immediately and then explain the situation at your appointment on the 19th. I imagine you will be prescribed Oestrogel (again) and Utrogestan to be taken cylically. There is no way that Studd would prescribe a combination HRT for you if you are progesterone intolerant. I think you might also need testosterone.
The gel kicks in very quickly and you will definitely be feeling an marked improvement by the time your appointment comes around. Under the circumstances, I would start with 3 pumps everyday and go on from there but again, explain what you are taking at the appointment.
Hope that helps.