is it ok to ask why you were taking estrogen monotherapy? Also, enanthate (EEn) as an ester is common with trans DIY HRT, but I've never heard of a pharmacy in the US having it (seems like valerate and cypionate are the two esters available).
I raise this because my question was for cis men, but it sounds like you were self administering estrogen likely for reasons that make you not a cis man ๐ (EDIT: based on your comments in femboy and trans communities, I'm pretty sure you're not the target demographic for my question, regardless of how you happen to identify currently).
2 months is not long given EEn's half life, it's possible your body continued to experiencd testosterone dominance for most of that time, I would guess the second month was more likely when you would experience loss of involuntary night-time erections, etc.
Did you get blood work to check your estrogen and testosterone blood levels during this time?