I've never posted in this forum so please be nice

I've been questioning my diagnosis a lot lately and bipolar is beginning to enter my mind as a possibility. I was diagnosed with BPD about a year and a half ago now but I really don't agree with this anymore. I never have fully accepted it and it seems even less likely to me now.

I don't think I have ever been manic though which is why I'm not sure about bipolar either. I go through phases though of being severely depressed and suicidal which lasts for weeks-months and then I will wake up one day and just feel better. I can suddenly feel happiness again. These phases last a few weeks generally before I inevetiably crash again.

I guess what I'm asking is if its possible to have bipolar without full blown mania?