Unfortunately any advice given on the site is not medically qualified even if it comes from a qualified medic.
No one knows your history, profile, bloods, heart physiology etc. So any comments are quite dangerous.
In the USA the major anti androgen prescribed to GID people is Cyproterone acetate, the common market name being Androcur. It blocks testosterone binding to its receptors and is commonly used in prostate disease.
It has many side effects as do all AAs, it can among lots, cause liver problems and muscle weakness. One of the major side effects for GID people in particular is that it can produce profound depression very quickly with little warning. GID people commonly suffer depression and on Androcur they can feel suicidal quite quickly. There are several threads on the site in relation to that.
It may also interact with a variety of other medications and its use needs careful observation.
The other common AA is Spironolactone, I have been told that it isn't available in the USA. This works by a different route on testosterone production, it has different side effects it is a diuretic and affects heart physiology, it may reduce blood pressure and is often used in Europe and Australia as a cardiac medication at a lower dose than used as an AA. It does not seem to produce depression. It can cause renal dysfunction.
Both drugs are dangerous to healthy people, with people with existing conditions they are not something to be messed with at all.
I do realise your problem and I have deep sympathy.
Please find a medic who you can talk to, if you google orange county transgender services you will find groups to help.
Hugs
Cindy