Has anybody got experiences with having bipolar 2 &amp; BPD aswell? &amp; if so how did you know/what made the diagnosis happen?

I'm honestly really starting to think that I don't just have BPD at this point &amp; I don't want to be all self diagnosing or anything, I just need some advice really. 
I've noticed especially in the latest 18 months, that I have cycles of my moods. I can be fine &amp; stable (with obviously BPD mood swings) for weeks, then I'll be super depressed &amp; suicidal &amp; low WITHOUT cause - as we know BPD mood swings are with cause. These lows usually last around 2 weeks, to the point I cannot get out of bed or do anything. I also don't have any other BPD swings in these lows, it's just pure depression. 
I've also noticed I have highs that last about a week which are just such a blur &amp; I am the most out of control person &amp; not myself at all. These highs are also without cause. 
I know BPD swings can last hours, to days. But I just feel like this isn't quite right &amp; I just have this feeling that it's something else. 
I've spoken to my counsellor about this but I just feel like she doesn't believe me &amp; tried to put it down to hormones. 
Just a side not aswell this has been happening since I was about 15, I'm now 20! 

Please don't hate on me, I'm just seeking advice &amp; opinions on this &amp; I'm so apprehensive about even posting this. 


