Could be a few things.
1) still have some high estrogen and that can cause shedding (remember different then thining)
2) hormonal change be it either estrogen, thyroid levels etc.,
3) the dht from the test or even how your body was affected by the compounds put most of your hairs in dormant/telegen and once it was out of your system it triggered them back into the process be it shedding
good news is with that kinda shedding itll grow back bro
1) still have some high estrogen and that can cause shedding (remember different then thining)
2) hormonal change be it either estrogen, thyroid levels etc.,
3) the dht from the test or even how your body was affected by the compounds put most of your hairs in dormant/telegen and once it was out of your system it triggered them back into the process be it shedding
good news is with that kinda shedding itll grow back bro