Mickib, there are a couple of odd things about your introduction to HRT. Doctors will usually like to see you in person before starting you on a regime which will change so much physically. And they should get baseline blood samples to guide their hormone decisions. Estradiol Valerate has a half life of 3-4 days, so weekly injections will expose you to highs and lows, usually causing emotional issues and not feeling good.
There are doctors, and there are doctors, and changing hormone in your body is serious stuff, so it requires a doctor who has experience in this field, and who will tailor treatment to your needs. Most doctors usually start with low dose oral or patches, as these can be changed quickly to suit how you feel. There are no formal courses for doctors to learn about Trans Medicine so, unfortunately, many base their treatments around old texts based on different medicines.
Based on blood levels, mono therapy, or bioidentical estradiol only, is seen as less risky than blockers and estradiol, so this method is gaining popularity. At the correct dose, Estradiol will suppress testosterone sufficiently for feminisation in most people, but there are some with persistent testosterone who will need the assistance of blockers. This is why early and frequent blood draws are helpful to guide treatment.
Honestly, I would canvas other trans people in your area to look for another doctor!
Hugs,
Allie