I can’t find anything on longterm enclomiphene, but we do know it is safer & lower sides than traditional Clomid. Here is a retroactive assessment of long term use of regular clomid, from 0 to 84 months looking at 400 men (120 of which used for over 3 years).
Of the 120 guys using over 3 years, 5(FIVE) reported significant changes in mood.
So, on the grounds that you are using a lower side drug & for a shorter duration, your odds of mood change would theoretically be lower than that ~4% we saw reported on full clomiphene.
Clomiphene citrate is not typically offered as primary treatment of hypogonadism in men who do not desire fertility preservation. These data demonstrate that clomiphene citrate is safe and effective with few side effects when used as long-term treatment of hypogonadism.
pubmed.ncbi.nlm.nih.gov
Click Full Text Links in the blue rectangle above the Abstract to click on that link for the full study, if interested.