I agree - do a full blood panel and see what is going on before you take anything...
I have been there and am again - anxiety could also be the issue as I am on HRT and experiencing some of the same disinterest...a year ago I would have interest a couple of times a DAY now it's more like once a week and I'm ok...not like me at all. Anxiety/depression will dry up your libido as quick as low test.
A LOT of factors are needed for proper libido...test being the primary, but also proper igf/gh level, enough sleep, mental clarity, relaxation, even your estrogen and prolactin levels need to be right (not too high but not zero either...).
SO that's why I say start with full blood workup - test, free test, t3/t4. igf, estradiol, liver/kidney function, blood counts and all your health indicators as well just for safety sake since it sounds like you are certain you are about to get back on...then repeat this every 6 months to stay healthy and monitor your levels.
Also I suggest moderation...if you jump on 800-1000mg of test...yeah you will want to bang anything you can, for a while. Then the shutdown and high estro levels and other sides take over and back where you started. See what doc suggests but if your main goal is just HRT and feeling good - 200-300mg test a week, a tiny bit of antiE, 250iu of hcg twice a week, and 2iu of gh once a day and you will feel and perform like you are 19 yrs old again...