Hi,
I am not an endocrinologist, but I have had 'hormone issues' for about 12 years, and as a scientist in my day job hoave a good overview of human hormone axis's.
So it is quite well reported that some birth control pills can cause 'susceptible' females excessive hair loss. This can even occur weeks after stopping taking the tablets. There are numerous pathways and reasons why this can occur and the only real way you can identify the cause is to get to see a good endo.. Whilst spiro cannot be totally ruled out of the equation, I think it is more likely a cause of the changes in hormone levels (from the pill mainly but also maybe the spiro), also, hair loss caused by birth control is usually temporary and stops within a few months.
The positive thing is that there are lots of ways these issues can be sorted and it is imperative you get it examined sooner rather than later.
Hope that helps a little?
Hugs
Sarah xx