Sounds about right.
BPD is the fast switching emotions (the weather). Bipolar is the long-lasting moods (the climate)--(hypo)mania/depression/euthymia.
One thing I can tell you is track your sleep and any particular, tangible symptoms you noticed (like spending more, different handwriting/more pressure, getting into a greater number of conflicts, talking more, whatever you notice happens when things aren't your norm).
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For example, I've been hypo/manic/mixed since like April and I know this because I've been journaling and keeping track of sleep and I've been sleeping like 0-4 hours almost every single freaking night since then, ****ing whoever whenever, drinking/drugging to an extreme extent, and have been constantly complaining about feeling depressed but it's obvious I'm more impulsive, energetic, and frantic than normal (things are settling).

Meds are key and, though there are patterns, "individuals respond to individual meds individually." Lithium is good for "classic" bipolar, then there's atypical antipsychotics like ziprasidone, aripiprazole, quetiapine, olanzapine, etc., and anticonvulsants like valproic acid, lamotrigine, carbamazepine, etc. Therapy helps too--and is essential with comorbidities like BPD. Antidepressants, as you found out, can trigger an elevated mood, but I guess sometimes they can be helpful if you're on some sort of mood stabilizer (I haven't found this to be the case but like I said, everyone is different).